31564235961 has 6 divisors (see below), whose sum is σ = 45592785290. Its totient is φ = 21042823968.

The previous prime is 31564235959. The next prime is 31564235981. The reversal of 31564235961 is 16953246513.

31564235961 is a `hidden beast` number, since 3 + 1 + 56 + 4 + 2 + 3 + 596 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 23246795961 + 8317440000 = 152469^2 + 91200^2 .

It is not a de Polignac number, because 31564235961 - 2¹ = 31564235959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31564235921) 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, 1753568656 + ... + 1753568673.

Almost surely, 2^31564235961 is an apocalyptic number.

It is an amenable number.

31564235961 is a deficient number, since it is larger than the sum of its proper divisors (14028549329).

31564235961 is a wasteful number, since it uses less digits than its factorization.

31564235961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3507137335 (or 3507137332 counting only the distinct ones).

The product of its digits is 583200, while the sum is 45.

The spelling of 31564235961 in words is "thirty-one billion, five hundred sixty-four million, two hundred thirty-five thousand, nine hundred sixty-one".