231601990871 has 16 divisors (see below), whose sum is σ = 242401959936. Its totient is φ = 220863372576.

The previous prime is 231601990859. The next prime is 231601990877. The reversal of 231601990871 is 178099106132.

It is a cyclic number.

It is not a de Polignac number, because 231601990871 - 2¹⁸ = 231601728727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231601990877) 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, 32880476 + ... + 32887518.

It is an arithmetic number, because the mean of its divisors is an integer number (15150122496).

Almost surely, 2^231601990871 is an apocalyptic number.

231601990871 is a deficient number, since it is larger than the sum of its proper divisors (10799969065).

231601990871 is a wasteful number, since it uses less digits than its factorization.

231601990871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11182.

The product of its (nonzero) digits is 163296, while the sum is 47.

The spelling of 231601990871 in words is "two hundred thirty-one billion, six hundred one million, nine hundred ninety thousand, eight hundred seventy-one".