315527981 has 2 divisors, whose sum is σ = 315527982. Its totient is φ = 315527980.

The previous prime is 315527969. The next prime is 315527987. The reversal of 315527981 is 189725513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 289170025 + 26357956 = 17005^2 + 5134^2 .

It is a cyclic number.

It is not a de Polignac number, because 315527981 - 2²⁶ = 248419117 is a prime.

It is a super-2 number, since 2×315527981² = 199115813587872722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315527987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157763990 + 157763991.

It is an arithmetic number, because the mean of its divisors is an integer number (157763991).

Almost surely, 2^315527981 is an apocalyptic number.

It is an amenable number.

315527981 is a deficient number, since it is larger than the sum of its proper divisors (1).

315527981 is an equidigital number, since it uses as much as digits as its factorization.

315527981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 41.

The square root of 315527981 is about 17763.1073013704. The cubic root of 315527981 is about 680.7891508651.

The spelling of 315527981 in words is "three hundred fifteen million, five hundred twenty-seven thousand, nine hundred eighty-one".