97957191 has 4 divisors (see below), whose sum is σ = 130609592. Its totient is φ = 65304792.

The previous prime is 97957187. The next prime is 97957199. The reversal of 97957191 is 19175979.

It is a happy number.

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

It is not a de Polignac number, because 97957191 - 2² = 97957187 is a prime.

It is a super-2 number, since 2×97957191² = 19191222537220962, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 97957191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97957199) 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, 16326196 + ... + 16326201.

It is an arithmetic number, because the mean of its divisors is an integer number (32652398).

Almost surely, 2^97957191 is an apocalyptic number.

97957191 is a deficient number, since it is larger than the sum of its proper divisors (32652401).

97957191 is a wasteful number, since it uses less digits than its factorization.

97957191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32652400.

The product of its digits is 178605, while the sum is 48.

The square root of 97957191 is about 9897.3325194216. The cubic root of 97957191 is about 460.9764873988.

The spelling of 97957191 in words is "ninety-seven million, nine hundred fifty-seven thousand, one hundred ninety-one".