315311231 has 4 divisors (see below), whose sum is σ = 317053464. Its totient is φ = 313569000.

The previous prime is 315311219. The next prime is 315311233. The reversal of 315311231 is 132113513.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-315311231 is a prime.

It is a super-2 number, since 2×315311231² = 198842344789470722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315311233) 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, 870845 + ... + 871206.

It is an arithmetic number, because the mean of its divisors is an integer number (79263366).

Almost surely, 2^315311231 is an apocalyptic number.

315311231 is a deficient number, since it is larger than the sum of its proper divisors (1742233).

315311231 is a wasteful number, since it uses less digits than its factorization.

315311231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1742232.

The product of its digits is 270, while the sum is 20.

The square root of 315311231 is about 17757.0051247388. The cubic root of 315311231 is about 680.6332271869.

Adding to 315311231 its reverse (132113513), we get a palindrome (447424744).

The spelling of 315311231 in words is "three hundred fifteen million, three hundred eleven thousand, two hundred thirty-one".