315565031 has 2 divisors, whose sum is σ = 315565032. Its totient is φ = 315565030.

The previous prime is 315565013. The next prime is 315565039. The reversal of 315565031 is 130565513.

Together with previous prime (315565013) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-315565031 is a prime.

It is a super-2 number, since 2×315565031² = 199162577580061922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 315564985 and 315565003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315565039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157782515 + 157782516.

It is an arithmetic number, because the mean of its divisors is an integer number (157782516).

Almost surely, 2^315565031 is an apocalyptic number.

315565031 is a deficient number, since it is larger than the sum of its proper divisors (1).

315565031 is an equidigital number, since it uses as much as digits as its factorization.

315565031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6750, while the sum is 29.

The square root of 315565031 is about 17764.1501626168. The cubic root of 315565031 is about 680.8157964162.

It can be divided in two parts, 3155 and 65031, that added together give a palindrome (68186).

The spelling of 315565031 in words is "three hundred fifteen million, five hundred sixty-five thousand, thirty-one".