97556881 has 2 divisors, whose sum is σ = 97556882. Its totient is φ = 97556880.

The previous prime is 97556843. The next prime is 97556933. The reversal of 97556881 is 18865579.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91987281 + 5569600 = 9591^2 + 2360^2 .

It is an emirp because it is prime and its reverse (18865579) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97556881 - 2⁹ = 97556369 is a prime.

It is a super-2 number, since 2×97556881² = 19034690060896322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (97556801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48778440 + 48778441.

It is an arithmetic number, because the mean of its divisors is an integer number (48778441).

Almost surely, 2^97556881 is an apocalyptic number.

It is an amenable number.

97556881 is a deficient number, since it is larger than the sum of its proper divisors (1).

97556881 is an equidigital number, since it uses as much as digits as its factorization.

97556881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 49.

The square root of 97556881 is about 9877.0886904998. The cubic root of 97556881 is about 460.3476908180.

The spelling of 97556881 in words is "ninety-seven million, five hundred fifty-six thousand, eight hundred eighty-one".