857093091931 has 2 divisors, whose sum is σ = 857093091932. Its totient is φ = 857093091930.

The previous prime is 857093091923. The next prime is 857093091961. The reversal of 857093091931 is 139190390758.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 857093091931 - 2³ = 857093091923 is a prime.

It is a super-2 number, since 2×857093091931² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (857093091961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428546545965 + 428546545966.

It is an arithmetic number, because the mean of its divisors is an integer number (428546545966).

Almost surely, 2^857093091931 is an apocalyptic number.

857093091931 is a deficient number, since it is larger than the sum of its proper divisors (1).

857093091931 is an equidigital number, since it uses as much as digits as its factorization.

857093091931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1837080, while the sum is 55.

The spelling of 857093091931 in words is "eight hundred fifty-seven billion, ninety-three million, ninety-one thousand, nine hundred thirty-one".