315631764721 has 16 divisors (see below), whose sum is σ = 388538080000. Its totient is φ = 249686774208.

The previous prime is 315631764713. The next prime is 315631764737. The reversal of 315631764721 is 127467136513.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 315631764721 - 2³ = 315631764713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (315634764721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 221500 + ... + 824818.

It is an arithmetic number, because the mean of its divisors is an integer number (24283630000).

Almost surely, 2^315631764721 is an apocalyptic number.

It is an amenable number.

315631764721 is a deficient number, since it is larger than the sum of its proper divisors (72906315279).

315631764721 is a wasteful number, since it uses less digits than its factorization.

315631764721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609088.

The product of its digits is 635040, while the sum is 46.

The spelling of 315631764721 in words is "three hundred fifteen billion, six hundred thirty-one million, seven hundred sixty-four thousand, seven hundred twenty-one".