31909520819089 has 16 divisors (see below), whose sum is σ = 34700062003200. Its totient is φ = 29220497673984.

The previous prime is 31909520819087. The next prime is 31909520819101. The reversal of 31909520819089 is 98091802590913.

It is not a de Polignac number, because 31909520819089 - 2¹ = 31909520819087 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31909520819089.

It is not an unprimeable number, because it can be changed into a prime (31909520819083) 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, 79506082 + ... + 79906420.

It is an arithmetic number, because the mean of its divisors is an integer number (2168753875200).

Almost surely, 2^{31909520819089} is an apocalyptic number.

It is an amenable number.

31909520819089 is a deficient number, since it is larger than the sum of its proper divisors (2790541184111).

31909520819089 is a wasteful number, since it uses less digits than its factorization.

31909520819089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527112.

The product of its (nonzero) digits is 12597120, while the sum is 64.

The spelling of 31909520819089 in words is "thirty-one trillion, nine hundred nine billion, five hundred twenty million, eight hundred nineteen thousand, eighty-nine".