315213381 has 12 divisors (see below), whose sum is σ = 520352352. Its totient is φ = 180121896.

The previous prime is 315213377. The next prime is 315213391. The reversal of 315213381 is 183312513.

315213381 is a `hidden beast` number, since 31 + 521 + 33 + 81 = 666.

It is not a de Polignac number, because 315213381 - 2² = 315213377 is a prime.

It is a super-2 number, since 2×315213381² = 198718951122902322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315213331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2501631 + ... + 2501756.

It is an arithmetic number, because the mean of its divisors is an integer number (43362696).

Almost surely, 2^315213381 is an apocalyptic number.

It is an amenable number.

315213381 is a deficient number, since it is larger than the sum of its proper divisors (205138971).

315213381 is a wasteful number, since it uses less digits than its factorization.

315213381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5003400 (or 5003397 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 315213381 is about 17754.2496602926. The cubic root of 315213381 is about 680.5628133173.

Adding to 315213381 its reverse (183312513), we get a palindrome (498525894).

The spelling of 315213381 in words is "three hundred fifteen million, two hundred thirteen thousand, three hundred eighty-one".