231257071836 has 72 divisors (see below), whose sum is σ = 668595214560. Its totient is φ = 66022096896.

The previous prime is 231257071817. The next prime is 231257071841. The reversal of 231257071836 is 638170752132.

231257071836 is a `hidden beast` number, since 2 + 3 + 1 + 2 + 570 + 71 + 8 + 3 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 231257071791 and 231257071800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31141 + ... + 680796.

Almost surely, 2^231257071836 is an apocalyptic number.

It is an amenable number.

231257071836 is an abundant number, since it is smaller than the sum of its proper divisors (437338142724).

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

231257071836 is a wasteful number, since it uses less digits than its factorization.

231257071836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713243 (or 713238 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 231257071836 in words is "two hundred thirty-one billion, two hundred fifty-seven million, seventy-one thousand, eight hundred thirty-six".