315523031 has 2 divisors, whose sum is σ = 315523032. Its totient is φ = 315523030.

The previous prime is 315522997. The next prime is 315523051. The reversal of 315523031 is 130325513.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 315523031 - 2¹⁰ = 315522007 is a prime.

It is a super-2 number, since 2×315523031² = 199109566182853922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 315522988 and 315523006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315523051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157761515 + 157761516.

It is an arithmetic number, because the mean of its divisors is an integer number (157761516).

Almost surely, 2^315523031 is an apocalyptic number.

315523031 is a deficient number, since it is larger than the sum of its proper divisors (1).

315523031 is an equidigital number, since it uses as much as digits as its factorization.

315523031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1350, while the sum is 23.

The square root of 315523031 is about 17762.9679670938. The cubic root of 315523031 is about 680.7855907752.

Adding to 315523031 its reverse (130325513), we get a palindrome (445848544).

The spelling of 315523031 in words is "three hundred fifteen million, five hundred twenty-three thousand, thirty-one".