97891597 has 4 divisors (see below), whose sum is σ = 98044956. Its totient is φ = 97738240.

The previous prime is 97891589. The next prime is 97891601. The reversal of 97891597 is 79519879.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 88472836 + 9418761 = 9406^2 + 3069^2 .

It is a cyclic number.

It is not a de Polignac number, because 97891597 - 2³ = 97891589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97891567) 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, 75718 + ... + 76999.

It is an arithmetic number, because the mean of its divisors is an integer number (24511239).

Almost surely, 2^97891597 is an apocalyptic number.

It is an amenable number.

97891597 is a deficient number, since it is larger than the sum of its proper divisors (153359).

97891597 is a wasteful number, since it uses less digits than its factorization.

97891597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153358.

The product of its digits is 1428840, while the sum is 55.

The square root of 97891597 is about 9894.0182433630. The cubic root of 97891597 is about 460.8735715466.

The spelling of 97891597 in words is "ninety-seven million, eight hundred ninety-one thousand, five hundred ninety-seven".