31808712136 has 24 divisors (see below), whose sum is σ = 62945570070. Its totient is φ = 15067283328.

The previous prime is 31808712107. The next prime is 31808712139. The reversal of 31808712136 is 63121780813.

It can be written as a sum of positive squares in only one way, i.e., 20447284036 + 11361428100 = 142994^2 + 106590^2 .

It is not an unprimeable number, because it can be changed into a prime (31808712139) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5504161 + ... + 5509936.

Almost surely, 2^31808712136 is an apocalyptic number.

It is an amenable number.

31808712136 is a deficient number, since it is larger than the sum of its proper divisors (31136857934).

31808712136 is a wasteful number, since it uses less digits than its factorization.

31808712136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11014141 (or 11014118 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The spelling of 31808712136 in words is "thirty-one billion, eight hundred eight million, seven hundred twelve thousand, one hundred thirty-six".