Number
-721
- Negative
- Odd
- 3 digits
-721 is an odd 3-digit integer and the negative of 721. It has 4 divisors and a digital root of 1.
Number properties
ParityOddnot divisible by 2
SignNegative
Absolute value721
Digit count3
Digit sum10
Digital root1repeated digit sum
PalindromicNoreads differently backwards
Factors & divisors
Prime factorisation−1 × 7 × 103
Distinct prime factors27, 103
Number of divisors4
Sum of divisors σ(n)832
SquarefreeYesno repeated prime factor
All divisors1, 7, 103, 7214 in total
Arithmetic
Representations
Decimal-721
Binary101101000110 bits
Octal1321
Hexadecimal2D1
Base 36K1
In wordsminus seven hundred and twenty-one
Ordinalminus seven hundred and twenty-first
Scientific notation-7.21 × 10^2
Engineering notation-721
Powers & multiples
-721 to the power 2519,841
-721 to the power 3-374,805,361
-721 to the power 4270,234,665,281
-721 to the power 5-194,839,193,667,601
First ten multiples-721, -1,442, -2,163, -2,884, -3,605, -4,326, -5,047, -5,768, -6,489, -7,210
Powers of twoBetween 2^9 (512) and 2^10 (1,024)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3No, remainder 1
Divisible by 4No, remainder 1
Divisible by 5No, remainder 1
Divisible by 6No, remainder 1
Divisible by 7Yes
Divisible by 8No, remainder 1
Divisible by 9No, remainder 1
Divisible by 10No, remainder 1
Divisible by 11No, remainder 6
Divisible by 12No, remainder 1
Divisible by 100No, remainder 21
As a percentage & fraction
As a percentage-72,100%
-721% as a decimal-7.21
-721% of 100-721
-721% of 1,000-7,210
As a fraction of 100-721/100
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