31931606193 has 4 divisors (see below), whose sum is σ = 42575474928. Its totient is φ = 21287737460.

The previous prime is 31931606173. The next prime is 31931606227. The reversal of 31931606193 is 39160613913.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31931606193 - 2⁹ = 31931605681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31931606153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5321934363 + ... + 5321934368.

It is an arithmetic number, because the mean of its divisors is an integer number (10643868732).

Almost surely, 2^31931606193 is an apocalyptic number.

It is an amenable number.

31931606193 is a deficient number, since it is larger than the sum of its proper divisors (10643868735).

31931606193 is a wasteful number, since it uses less digits than its factorization.

31931606193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10643868734.

The product of its (nonzero) digits is 78732, while the sum is 42.

The spelling of 31931606193 in words is "thirty-one billion, nine hundred thirty-one million, six hundred six thousand, one hundred ninety-three".