82131165591 has 4 divisors (see below), whose sum is σ = 109508220792. Its totient is φ = 54754110392.

The previous prime is 82131165587. The next prime is 82131165607. The reversal of 82131165591 is 19556113128.

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 82131165591 - 2² = 82131165587 is a prime.

It is a super-2 number, since 2×82131165591² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82131165511) 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, 13688527596 + ... + 13688527601.

It is an arithmetic number, because the mean of its divisors is an integer number (27377055198).

Almost surely, 2^82131165591 is an apocalyptic number.

82131165591 is a deficient number, since it is larger than the sum of its proper divisors (27377055201).

82131165591 is a wasteful number, since it uses less digits than its factorization.

82131165591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27377055200.

The product of its digits is 64800, while the sum is 42.

The spelling of 82131165591 in words is "eighty-two billion, one hundred thirty-one million, one hundred sixty-five thousand, five hundred ninety-one".