315968551 has 2 divisors, whose sum is σ = 315968552. Its totient is φ = 315968550.

The previous prime is 315968519. The next prime is 315968561. The reversal of 315968551 is 155869513.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 315968551 - 2⁵ = 315968519 is a prime.

It is a super-2 number, since 2×315968551² = 199672250442079202, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 315968498 and 315968507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315968561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157984275 + 157984276.

It is an arithmetic number, because the mean of its divisors is an integer number (157984276).

Almost surely, 2^315968551 is an apocalyptic number.

315968551 is a deficient number, since it is larger than the sum of its proper divisors (1).

315968551 is an equidigital number, since it uses as much as digits as its factorization.

315968551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162000, while the sum is 43.

The square root of 315968551 is about 17775.5042403865. The cubic root of 315968551 is about 681.1058642292.

The spelling of 315968551 in words is "three hundred fifteen million, nine hundred sixty-eight thousand, five hundred fifty-one".