82131723587 has 4 divisors (see below), whose sum is σ = 82451302536. Its totient is φ = 81812144640.

The previous prime is 82131723563. The next prime is 82131723589. The reversal of 82131723587 is 78532713128.

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 82131723587 - 2²² = 82127529283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82131723589) 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, 159789089 + ... + 159789602.

It is an arithmetic number, because the mean of its divisors is an integer number (20612825634).

Almost surely, 2^82131723587 is an apocalyptic number.

82131723587 is a deficient number, since it is larger than the sum of its proper divisors (319578949).

82131723587 is a wasteful number, since it uses less digits than its factorization.

82131723587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319578948.

The product of its digits is 564480, while the sum is 47.

The spelling of 82131723587 in words is "eighty-two billion, one hundred thirty-one million, seven hundred twenty-three thousand, five hundred eighty-seven".