97688561 has 4 divisors (see below), whose sum is σ = 99960432. Its totient is φ = 95416692.

The previous prime is 97688551. The next prime is 97688597. The reversal of 97688561 is 16588679.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 97688561 - 2¹⁰ = 97687537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (97688551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1135871 + ... + 1135956.

It is an arithmetic number, because the mean of its divisors is an integer number (24990108).

Almost surely, 2^97688561 is an apocalyptic number.

It is an amenable number.

97688561 is a deficient number, since it is larger than the sum of its proper divisors (2271871).

97688561 is a wasteful number, since it uses less digits than its factorization.

97688561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2271870.

The product of its digits is 725760, while the sum is 50.

The square root of 97688561 is about 9883.7523744780. The cubic root of 97688561 is about 460.5547198862.

The spelling of 97688561 in words is "ninety-seven million, six hundred eighty-eight thousand, five hundred sixty-one".