315742731 has 4 divisors (see below), whose sum is σ = 420990312. Its totient is φ = 210495152.

The previous prime is 315742709. The next prime is 315742733. The reversal of 315742731 is 137247513.

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 315742731 - 2¹³ = 315734539 is a prime.

It is a super-2 number, since 2×315742731² = 199386944358676722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 315742692 and 315742701.

It is not an unprimeable number, because it can be changed into a prime (315742733) 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, 52623786 + ... + 52623791.

It is an arithmetic number, because the mean of its divisors is an integer number (105247578).

Almost surely, 2^315742731 is an apocalyptic number.

315742731 is a deficient number, since it is larger than the sum of its proper divisors (105247581).

315742731 is a wasteful number, since it uses less digits than its factorization.

315742731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105247580.

The product of its digits is 17640, while the sum is 33.

The square root of 315742731 is about 17769.1511052160. The cubic root of 315742731 is about 680.9435653950.

The spelling of 315742731 in words is "three hundred fifteen million, seven hundred forty-two thousand, seven hundred thirty-one".