857538579031 has 4 divisors (see below), whose sum is σ = 857617647552. Its totient is φ = 857459510512.

The previous prime is 857538579011. The next prime is 857538579043. The reversal of 857538579031 is 130975835758.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130975835758 = 2 ⋅65487917879.

It is a cyclic number.

It is not a de Polignac number, because 857538579031 - 2²⁹ = 857001708119 is a prime.

It is a super-2 number, since 2×857538579031² (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 (857538579011) 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, 39517990 + ... + 39539683.

It is an arithmetic number, because the mean of its divisors is an integer number (214404411888).

Almost surely, 2^857538579031 is an apocalyptic number.

857538579031 is a deficient number, since it is larger than the sum of its proper divisors (79068521).

857538579031 is a wasteful number, since it uses less digits than its factorization.

857538579031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79068520.

The product of its (nonzero) digits is 31752000, while the sum is 61.

The spelling of 857538579031 in words is "eight hundred fifty-seven billion, five hundred thirty-eight million, five hundred seventy-nine thousand, thirty-one".