97165561 has 2 divisors, whose sum is σ = 97165562. Its totient is φ = 97165560.

The previous prime is 97165517. The next prime is 97165567. The reversal of 97165561 is 16556179.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56715961 + 40449600 = 7531^2 + 6360^2 .

It is an emirp because it is prime and its reverse (16556179) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97165561 - 2²³ = 88776953 is a prime.

It is a super-2 number, since 2×97165561² = 18882292488889442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (97165567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48582780 + 48582781.

It is an arithmetic number, because the mean of its divisors is an integer number (48582781).

Almost surely, 2^97165561 is an apocalyptic number.

It is an amenable number.

97165561 is a deficient number, since it is larger than the sum of its proper divisors (1).

97165561 is an equidigital number, since it uses as much as digits as its factorization.

97165561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56700, while the sum is 40.

The square root of 97165561 is about 9857.2593046952. The cubic root of 97165561 is about 459.7313506954.

The spelling of 97165561 in words is "ninety-seven million, one hundred sixty-five thousand, five hundred sixty-one".