31352520091 has 16 divisors (see below), whose sum is σ = 31995849600. Its totient is φ = 30716496000.

The previous prime is 31352520029. The next prime is 31352520109. The reversal of 31352520091 is 19002525313.

It is a cyclic number.

It is not a de Polignac number, because 31352520091 - 2⁹ = 31352519579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31352520191) 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, 11436981 + ... + 11439721.

It is an arithmetic number, because the mean of its divisors is an integer number (1999740600).

Almost surely, 2^31352520091 is an apocalyptic number.

31352520091 is a deficient number, since it is larger than the sum of its proper divisors (643329509).

31352520091 is a wasteful number, since it uses less digits than its factorization.

31352520091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3990.

The product of its (nonzero) digits is 8100, while the sum is 31.

The spelling of 31352520091 in words is "thirty-one billion, three hundred fifty-two million, five hundred twenty thousand, ninety-one".