231170722128 has 60 divisors (see below), whose sum is σ = 681007325440. Its totient is φ = 73001279808.

The previous prime is 231170722093. The next prime is 231170722183. The reversal of 231170722128 is 821227071132.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 231170722092 and 231170722101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42243376 + ... + 42248847.

Almost surely, 2^231170722128 is an apocalyptic number.

It is an amenable number.

231170722128 is an abundant number, since it is smaller than the sum of its proper divisors (449836603312).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231170722128 is a wasteful number, since it uses less digits than its factorization.

231170722128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84492256 (or 84492247 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The spelling of 231170722128 in words is "two hundred thirty-one billion, one hundred seventy million, seven hundred twenty-two thousand, one hundred twenty-eight".