31940932091 has 4 divisors (see below), whose sum is σ = 33622033800. Its totient is φ = 30259830384.

The previous prime is 31940932063. The next prime is 31940932099. The reversal of 31940932091 is 19023904913.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19023904913 = 13 ⋅1463377301.

It is a cyclic number.

It is not a de Polignac number, because 31940932091 - 2⁶ = 31940932027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31940932099) 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, 840550826 + ... + 840550863.

It is an arithmetic number, because the mean of its divisors is an integer number (8405508450).

Almost surely, 2^31940932091 is an apocalyptic number.

31940932091 is a deficient number, since it is larger than the sum of its proper divisors (1681101709).

31940932091 is a wasteful number, since it uses less digits than its factorization.

31940932091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1681101708.

The product of its (nonzero) digits is 52488, while the sum is 41.

The spelling of 31940932091 in words is "thirty-one billion, nine hundred forty million, nine hundred thirty-two thousand, ninety-one".