97318530691 has 4 divisors (see below), whose sum is σ = 97321126192. Its totient is φ = 97315935192.

The previous prime is 97318530679. The next prime is 97318530719. The reversal of 97318530691 is 19603581379.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19603581379 = 19 ⋅1031767441.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97318530691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97318530791) 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, 1240671 + ... + 1316776.

It is an arithmetic number, because the mean of its divisors is an integer number (24330281548).

Almost surely, 2^97318530691 is an apocalyptic number.

97318530691 is a deficient number, since it is larger than the sum of its proper divisors (2595501).

97318530691 is a wasteful number, since it uses less digits than its factorization.

97318530691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2595500.

The product of its (nonzero) digits is 1224720, while the sum is 52.

The spelling of 97318530691 in words is "ninety-seven billion, three hundred eighteen million, five hundred thirty thousand, six hundred ninety-one".