97857075931 has 2 divisors, whose sum is σ = 97857075932. Its totient is φ = 97857075930.

The previous prime is 97857075871. The next prime is 97857075937. The reversal of 97857075931 is 13957075879.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 97857075931 - 2⁷ = 97857075803 is a prime.

It is a super-2 number, since 2×97857075931² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 97857075931.

It is not a weakly prime, because it can be changed into another prime (97857075937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48928537965 + 48928537966.

It is an arithmetic number, because the mean of its divisors is an integer number (48928537966).

Almost surely, 2^97857075931 is an apocalyptic number.

97857075931 is a deficient number, since it is larger than the sum of its proper divisors (1).

97857075931 is an equidigital number, since it uses as much as digits as its factorization.

97857075931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16669800, while the sum is 61.

It can be divided in two parts, 978570 and 75931, that added together give a palindrome (1054501).

The spelling of 97857075931 in words is "ninety-seven billion, eight hundred fifty-seven million, seventy-five thousand, nine hundred thirty-one".