31381125617 has 16 divisors (see below), whose sum is σ = 32485972992. Its totient is φ = 30295399680.

The previous prime is 31381125551. The next prime is 31381125631. The reversal of 31381125617 is 71652118313.

It is a cyclic number.

It is not a de Polignac number, because 31381125617 - 2²⁰ = 31380077041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31381125637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1277273 + ... + 1301609.

It is an arithmetic number, because the mean of its divisors is an integer number (2030373312).

Almost surely, 2^31381125617 is an apocalyptic number.

It is an amenable number.

31381125617 is a deficient number, since it is larger than the sum of its proper divisors (1104847375).

31381125617 is a wasteful number, since it uses less digits than its factorization.

31381125617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24728.

The product of its digits is 30240, while the sum is 38.

The spelling of 31381125617 in words is "thirty-one billion, three hundred eighty-one million, one hundred twenty-five thousand, six hundred seventeen".