97897931 has 2 divisors, whose sum is σ = 97897932. Its totient is φ = 97897930.

The previous prime is 97897927. The next prime is 97897973. The reversal of 97897931 is 13979879.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 97897931 - 2² = 97897927 is a prime.

It is a super-2 number, since 2×97897931² = 19168009788161522, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (97897031) 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, 48948965 + 48948966.

It is an arithmetic number, because the mean of its divisors is an integer number (48948966).

Almost surely, 2^97897931 is an apocalyptic number.

97897931 is a deficient number, since it is larger than the sum of its proper divisors (1).

97897931 is an equidigital number, since it uses as much as digits as its factorization.

97897931 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 97897931 is about 9894.3383305808. The cubic root of 97897931 is about 460.8835114881.

The spelling of 97897931 in words is "ninety-seven million, eight hundred ninety-seven thousand, nine hundred thirty-one".