97918993 has 8 divisors (see below), whose sum is σ = 101442600. Its totient is φ = 94405248.

The previous prime is 97918979. The next prime is 97919021. The reversal of 97918993 is 39981979.

It can be written as a sum of positive squares in 4 ways, for example, as 4545424 + 93373569 = 2132^2 + 9663^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 97918993 - 2²⁵ = 64364561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97918943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22005 + ... + 26077.

It is an arithmetic number, because the mean of its divisors is an integer number (12680325).

Almost surely, 2^97918993 is an apocalyptic number.

It is an amenable number.

97918993 is a deficient number, since it is larger than the sum of its proper divisors (3523607).

97918993 is a wasteful number, since it uses less digits than its factorization.

97918993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4931.

The product of its digits is 1102248, while the sum is 55.

The square root of 97918993 is about 9895.4026193986. The cubic root of 97918993 is about 460.9165609862.

The spelling of 97918993 in words is "ninety-seven million, nine hundred eighteen thousand, nine hundred ninety-three".