315235784721 has 32 divisors (see below), whose sum is σ = 494285984640. Its totient is φ = 176180659200.

The previous prime is 315235784719. The next prime is 315235784741. The reversal of 315235784721 is 127487532513.

It is not a de Polignac number, because 315235784721 - 2¹ = 315235784719 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (315235784741) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68731 + ... + 796991.

It is an arithmetic number, because the mean of its divisors is an integer number (15446437020).

Almost surely, 2^315235784721 is an apocalyptic number.

It is an amenable number.

315235784721 is a deficient number, since it is larger than the sum of its proper divisors (179050199919).

315235784721 is a wasteful number, since it uses less digits than its factorization.

315235784721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729297.

The product of its digits is 1411200, while the sum is 48.

The spelling of 315235784721 in words is "three hundred fifteen billion, two hundred thirty-five million, seven hundred eighty-four thousand, seven hundred twenty-one".