315752381 has 4 divisors (see below), whose sum is σ = 360859872. Its totient is φ = 270644892.

The previous prime is 315752369. The next prime is 315752383. The reversal of 315752381 is 183257513.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 183257513 = 10243 ⋅17891.

It is not a de Polignac number, because 315752381 - 2²² = 311558077 is a prime.

It is a super-2 number, since 2×315752381² = 199399132214338322, 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 (315752383) 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, 22553735 + ... + 22553748.

It is an arithmetic number, because the mean of its divisors is an integer number (90214968).

Almost surely, 2^315752381 is an apocalyptic number.

It is an amenable number.

315752381 is a deficient number, since it is larger than the sum of its proper divisors (45107491).

315752381 is an equidigital number, since it uses as much as digits as its factorization.

315752381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45107490.

The product of its digits is 25200, while the sum is 35.

The square root of 315752381 is about 17769.4226411552. The cubic root of 315752381 is about 680.9505025180.

The spelling of 315752381 in words is "three hundred fifteen million, seven hundred fifty-two thousand, three hundred eighty-one".