97171561 has 2 divisors, whose sum is σ = 97171562. Its totient is φ = 97171560.

The previous prime is 97171559. The next prime is 97171603. The reversal of 97171561 is 16517179.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62726400 + 34445161 = 7920^2 + 5869^2 .

It is a cyclic number.

It is not a de Polignac number, because 97171561 - 2¹ = 97171559 is a prime.

Together with 97171559, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 97171561.

It is not a weakly prime, because it can be changed into another prime (97171531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48585780 + 48585781.

It is an arithmetic number, because the mean of its divisors is an integer number (48585781).

Almost surely, 2^97171561 is an apocalyptic number.

It is an amenable number.

97171561 is a deficient number, since it is larger than the sum of its proper divisors (1).

97171561 is an equidigital number, since it uses as much as digits as its factorization.

97171561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13230, while the sum is 37.

The square root of 97171561 is about 9857.5636442277. The cubic root of 97171561 is about 459.7408133462.

The spelling of 97171561 in words is "ninety-seven million, one hundred seventy-one thousand, five hundred sixty-one".