82431100391 has 4 divisors (see below), whose sum is σ = 82699605912. Its totient is φ = 82162594872.

The previous prime is 82431100357. The next prime is 82431100397. The reversal of 82431100391 is 19300113428.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 82431100391 - 2²² = 82426906087 is a prime.

It is a super-2 number, since 2×82431100391² (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 (82431100397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134252300 + ... + 134252913.

It is an arithmetic number, because the mean of its divisors is an integer number (20674901478).

Almost surely, 2^82431100391 is an apocalyptic number.

82431100391 is a deficient number, since it is larger than the sum of its proper divisors (268505521).

82431100391 is a wasteful number, since it uses less digits than its factorization.

82431100391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268505520.

The product of its (nonzero) digits is 5184, while the sum is 32.

The spelling of 82431100391 in words is "eighty-two billion, four hundred thirty-one million, one hundred thousand, three hundred ninety-one".