31860786673 has 4 divisors (see below), whose sum is σ = 31861473268. Its totient is φ = 31860100080.

The previous prime is 31860786653. The next prime is 31860786697. The reversal of 31860786673 is 37668706813.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23431343329 + 8429443344 = 153073^2 + 91812^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31860786673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31860786653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268218 + ... + 368323.

It is an arithmetic number, because the mean of its divisors is an integer number (7965368317).

Almost surely, 2^31860786673 is an apocalyptic number.

It is an amenable number.

31860786673 is a deficient number, since it is larger than the sum of its proper divisors (686595).

31860786673 is an equidigital number, since it uses as much as digits as its factorization.

31860786673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686594.

The product of its (nonzero) digits is 6096384, while the sum is 55.

The spelling of 31860786673 in words is "thirty-one billion, eight hundred sixty million, seven hundred eighty-six thousand, six hundred seventy-three".