97657999 has 4 divisors (see below), whose sum is σ = 97677936. Its totient is φ = 97638064.

The previous prime is 97657991. The next prime is 97658053. The reversal of 97657999 is 99975679.

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 97657999 - 2³ = 97657991 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 (97657991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3027 + ... + 14299.

It is an arithmetic number, because the mean of its divisors is an integer number (24419484).

Almost surely, 2^97657999 is an apocalyptic number.

97657999 is a deficient number, since it is larger than the sum of its proper divisors (19937).

97657999 is a wasteful number, since it uses less digits than its factorization.

97657999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19936.

The product of its digits is 9644670, while the sum is 61.

The square root of 97657999 is about 9882.2061808080. The cubic root of 97657999 is about 460.5066864853.

The spelling of 97657999 in words is "ninety-seven million, six hundred fifty-seven thousand, nine hundred ninety-nine".