857762812831 has 4 divisors (see below), whose sum is σ = 861508502200. Its totient is φ = 854017123464.

The previous prime is 857762812763. The next prime is 857762812853. The reversal of 857762812831 is 138218267758.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 138218267758 = 2 ⋅69109133879.

It is a cyclic number.

It is not a de Polignac number, because 857762812831 - 2⁷ = 857762812703 is a prime.

It is a super-2 number, since 2×857762812831² (a number of 25 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 (857762812031) 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, 1872844341 + ... + 1872844798.

It is an arithmetic number, because the mean of its divisors is an integer number (215377125550).

Almost surely, 2^857762812831 is an apocalyptic number.

857762812831 is a deficient number, since it is larger than the sum of its proper divisors (3745689369).

857762812831 is a wasteful number, since it uses less digits than its factorization.

857762812831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3745689368.

The product of its digits is 9031680, while the sum is 58.

The spelling of 857762812831 in words is "eight hundred fifty-seven billion, seven hundred sixty-two million, eight hundred twelve thousand, eight hundred thirty-one".