84640931331 has 16 divisors (see below), whose sum is σ = 124597388160. Its totient is φ = 50679489920.

The previous prime is 84640931299. The next prime is 84640931357. The reversal of 84640931331 is 13313904648.

It is a cyclic number.

It is not a de Polignac number, because 84640931331 - 2⁵ = 84640931299 is a prime.

It is a super-2 number, since 2×84640931331² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (84640931371) 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, 15448326 + ... + 15453803.

It is an arithmetic number, because the mean of its divisors is an integer number (7787336760).

Almost surely, 2^84640931331 is an apocalyptic number.

84640931331 is a deficient number, since it is larger than the sum of its proper divisors (39956456829).

84640931331 is a wasteful number, since it uses less digits than its factorization.

84640931331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30902226.

The product of its (nonzero) digits is 186624, while the sum is 42.

The spelling of 84640931331 in words is "eighty-four billion, six hundred forty million, nine hundred thirty-one thousand, three hundred thirty-one".