315640331 has 4 divisors (see below), whose sum is σ = 332253000. Its totient is φ = 299027664.

The previous prime is 315640279. The next prime is 315640363. The reversal of 315640331 is 133046513.

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 315640331 - 2⁶ = 315640267 is a prime.

It is a super-2 number, since 2×315640331² = 199257637107579122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 315640331.

It is not an unprimeable number, because it can be changed into a prime (315640531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8306306 + ... + 8306343.

It is an arithmetic number, because the mean of its divisors is an integer number (83063250).

Almost surely, 2^315640331 is an apocalyptic number.

315640331 is a deficient number, since it is larger than the sum of its proper divisors (16612669).

315640331 is a wasteful number, since it uses less digits than its factorization.

315640331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16612668.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 315640331 is about 17766.2694733588. The cubic root of 315640331 is about 680.8699441061.

Adding to 315640331 its reverse (133046513), we get a palindrome (448686844).

The spelling of 315640331 in words is "three hundred fifteen million, six hundred forty thousand, three hundred thirty-one".