82131859 has 4 divisors (see below), whose sum is σ = 82150816. Its totient is φ = 82112904.

The previous prime is 82131853. The next prime is 82131869. The reversal of 82131859 is 95813128.

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 82131859 - 2²³ = 73743251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82131853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 577 + ... + 12829.

It is an arithmetic number, because the mean of its divisors is an integer number (20537704).

Almost surely, 2^82131859 is an apocalyptic number.

82131859 is a deficient number, since it is larger than the sum of its proper divisors (18957).

82131859 is a wasteful number, since it uses less digits than its factorization.

82131859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18956.

The product of its digits is 17280, while the sum is 37.

The square root of 82131859 is about 9062.6629088806. The cubic root of 82131859 is about 434.6808933731.

The spelling of 82131859 in words is "eighty-two million, one hundred thirty-one thousand, eight hundred fifty-nine".