31319417091 has 32 divisors (see below), whose sum is σ = 42988796928. Its totient is φ = 20271121920.

The previous prime is 31319417083. The next prime is 31319417093. The reversal of 31319417091 is 19071491313.

It is not a de Polignac number, because 31319417091 - 2³ = 31319417083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31319417093) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17623995 + ... + 17625771.

It is an arithmetic number, because the mean of its divisors is an integer number (1343399904).

Almost surely, 2^31319417091 is an apocalyptic number.

31319417091 is a deficient number, since it is larger than the sum of its proper divisors (11669379837).

31319417091 is a wasteful number, since it uses less digits than its factorization.

31319417091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2571.

The product of its (nonzero) digits is 20412, while the sum is 39.

The spelling of 31319417091 in words is "thirty-one billion, three hundred nineteen million, four hundred seventeen thousand, ninety-one".