31217124861 has 24 divisors (see below), whose sum is σ = 48777770496. Its totient is φ = 19124376480.

The previous prime is 31217124859. The next prime is 31217124881. The reversal of 31217124861 is 16842171213.

31217124861 is a `hidden beast` number, since 3 + 1 + 2 + 171 + 2 + 486 + 1 = 666.

It is not a de Polignac number, because 31217124861 - 2¹ = 31217124859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31217124881) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 572145 + ... + 624326.

It is an arithmetic number, because the mean of its divisors is an integer number (2032407104).

Almost surely, 2^31217124861 is an apocalyptic number.

It is an amenable number.

31217124861 is a deficient number, since it is larger than the sum of its proper divisors (17560645635).

31217124861 is a wasteful number, since it uses less digits than its factorization.

31217124861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196713 (or 1196710 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The spelling of 31217124861 in words is "thirty-one billion, two hundred seventeen million, one hundred twenty-four thousand, eight hundred sixty-one".