318831641721 has 32 divisors (see below), whose sum is σ = 473154000000. Its totient is φ = 212189912064.

The previous prime is 318831641719. The next prime is 318831641731. The reversal of 318831641721 is 127146138813.

318831641721 is a `hidden beast` number, since 3 + 188 + 31 + 6 + 417 + 21 = 666.

318831641721 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 318831641721 - 2¹ = 318831641719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (318831641731) 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, 43262925 + ... + 43270293.

It is an arithmetic number, because the mean of its divisors is an integer number (14786062500).

Almost surely, 2^318831641721 is an apocalyptic number.

It is an amenable number.

318831641721 is a deficient number, since it is larger than the sum of its proper divisors (154322358279).

318831641721 is a wasteful number, since it uses less digits than its factorization.

318831641721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9910 (or 9904 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The spelling of 318831641721 in words is "three hundred eighteen billion, eight hundred thirty-one million, six hundred forty-one thousand, seven hundred twenty-one".