97561599 has 16 divisors (see below), whose sum is σ = 137182080. Its totient is φ = 61503840.

The previous prime is 97561579. The next prime is 97561609. The reversal of 97561599 is 99516579.

It is a happy number.

It is not a de Polignac number, because 97561599 - 2²⁰ = 96513023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97561549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38149 + ... + 40625.

It is an arithmetic number, because the mean of its divisors is an integer number (8573880).

Almost surely, 2^97561599 is an apocalyptic number.

97561599 is a deficient number, since it is larger than the sum of its proper divisors (39620481).

97561599 is a wasteful number, since it uses less digits than its factorization.

97561599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3190.

The product of its digits is 765450, while the sum is 51.

The square root of 97561599 is about 9877.3275231714. The cubic root of 97561599 is about 460.3551117379.

The spelling of 97561599 in words is "ninety-seven million, five hundred sixty-one thousand, five hundred ninety-nine".