315305231 has 4 divisors (see below), whose sum is σ = 323827032. Its totient is φ = 306783432.

The previous prime is 315305203. The next prime is 315305251. The reversal of 315305231 is 132503513.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 315305231 - 2¹⁸ = 315043087 is a prime.

It is a super-2 number, since 2×315305231² = 198834777391926722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 315305197 and 315305206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315305251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4260845 + ... + 4260918.

It is an arithmetic number, because the mean of its divisors is an integer number (80956758).

Almost surely, 2^315305231 is an apocalyptic number.

315305231 is a deficient number, since it is larger than the sum of its proper divisors (8521801).

315305231 is an equidigital number, since it uses as much as digits as its factorization.

315305231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8521800.

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

The square root of 315305231 is about 17756.8361765265. The cubic root of 315305231 is about 680.6289099443.

Adding to 315305231 its reverse (132503513), we get a palindrome (447808744).

The spelling of 315305231 in words is "three hundred fifteen million, three hundred five thousand, two hundred thirty-one".