210031312991 has 16 divisors (see below), whose sum is σ = 225382385088. Its totient is φ = 195236659200.

The previous prime is 210031312957. The next prime is 210031313021. The reversal of 210031312991 is 199213130012.

It is a happy number.

It is not a de Polignac number, because 210031312991 - 2²⁶ = 209964204127 is a prime.

It is a super-2 number, since 2×210031312991² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210031312591) 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, 190970 + ... + 675671.

It is an arithmetic number, because the mean of its divisors is an integer number (14086399068).

Almost surely, 2^210031312991 is an apocalyptic number.

210031312991 is a deficient number, since it is larger than the sum of its proper divisors (15351072097).

210031312991 is a wasteful number, since it uses less digits than its factorization.

210031312991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866962.

The product of its (nonzero) digits is 2916, while the sum is 32.

The spelling of 210031312991 in words is "two hundred ten billion, thirty-one million, three hundred twelve thousand, nine hundred ninety-one".