97579891 has 4 divisors (see below), whose sum is σ = 97888032. Its totient is φ = 97271752.

The previous prime is 97579883. The next prime is 97579897. The reversal of 97579891 is 19897579.

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

It is a cyclic number.

It is not a de Polignac number, because 97579891 - 2³ = 97579883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97579897) 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, 153595 + ... + 154228.

It is an arithmetic number, because the mean of its divisors is an integer number (24472008).

Almost surely, 2^97579891 is an apocalyptic number.

97579891 is a deficient number, since it is larger than the sum of its proper divisors (308141).

97579891 is a wasteful number, since it uses less digits than its factorization.

97579891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308140.

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

The square root of 97579891 is about 9878.2534387411. The cubic root of 97579891 is about 460.3838808765.

The spelling of 97579891 in words is "ninety-seven million, five hundred seventy-nine thousand, eight hundred ninety-one".