97979831 has 2 divisors, whose sum is σ = 97979832. Its totient is φ = 97979830.

The previous prime is 97979821. The next prime is 97979837. The reversal of 97979831 is 13897979.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 97979831 - 2²⁶ = 30870967 is a prime.

It is a super-2 number, since 2×97979831² = 19200094565577122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97979837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48989915 + 48989916.

It is an arithmetic number, because the mean of its divisors is an integer number (48989916).

Almost surely, 2^97979831 is an apocalyptic number.

97979831 is a deficient number, since it is larger than the sum of its proper divisors (1).

97979831 is an equidigital number, since it uses as much as digits as its factorization.

97979831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 857304, while the sum is 53.

The square root of 97979831 is about 9898.4761958596. The cubic root of 97979831 is about 461.0119985019.

The spelling of 97979831 in words is "ninety-seven million, nine hundred seventy-nine thousand, eight hundred thirty-one".