31688325091 has 16 divisors (see below), whose sum is σ = 33831046656. Its totient is φ = 29577010176.

The previous prime is 31688325089. The next prime is 31688325113. The reversal of 31688325091 is 19052388613.

It is not a de Polignac number, because 31688325091 - 2¹ = 31688325089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31688325791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2525365 + ... + 2537881.

It is an arithmetic number, because the mean of its divisors is an integer number (2114440416).

Almost surely, 2^31688325091 is an apocalyptic number.

31688325091 is a deficient number, since it is larger than the sum of its proper divisors (2142721565).

31688325091 is a wasteful number, since it uses less digits than its factorization.

31688325091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13758.

The product of its (nonzero) digits is 311040, while the sum is 46.

The spelling of 31688325091 in words is "thirty-one billion, six hundred eighty-eight million, three hundred twenty-five thousand, ninety-one".