81592838791 has 8 divisors (see below), whose sum is σ = 82400844960. Its totient is φ = 80788635648.

The previous prime is 81592838773. The next prime is 81592838827. The reversal of 81592838791 is 19783829518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81592838791 - 2¹⁷ = 81592707719 is a prime.

It is a super-2 number, since 2×81592838791² (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 (81592838771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 907626 + ... + 993463.

It is an arithmetic number, because the mean of its divisors is an integer number (10300105620).

Almost surely, 2^81592838791 is an apocalyptic number.

81592838791 is a deficient number, since it is larger than the sum of its proper divisors (808006169).

81592838791 is a wasteful number, since it uses less digits than its factorization.

81592838791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1901513.

The product of its digits is 8709120, while the sum is 61.

The spelling of 81592838791 in words is "eighty-one billion, five hundred ninety-two million, eight hundred thirty-eight thousand, seven hundred ninety-one".