31531850164 has 12 divisors (see below), whose sum is σ = 55185270084. Its totient is φ = 15764630144.

The previous prime is 31531850111. The next prime is 31531850171. The reversal of 31531850164 is 46105813513.

It can be written as a sum of positive squares in 2 ways, for example, as 3689590564 + 27842259600 = 60742^2 + 166860^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267877 + ... + 367180.

It is an arithmetic number, because the mean of its divisors is an integer number (4598772507).

Almost surely, 2^31531850164 is an apocalyptic number.

It is an amenable number.

31531850164 is a deficient number, since it is larger than the sum of its proper divisors (23653419920).

31531850164 is a wasteful number, since it uses less digits than its factorization.

31531850164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647474 (or 647472 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

The spelling of 31531850164 in words is "thirty-one billion, five hundred thirty-one million, eight hundred fifty thousand, one hundred sixty-four".