97161391 has 4 divisors (see below), whose sum is σ = 97192912. Its totient is φ = 97129872.

The previous prime is 97161329. The next prime is 97161419. The reversal of 97161391 is 19316179.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19316179 = 19 ⋅1016641.

It is a cyclic number.

It is not a de Polignac number, because 97161391 - 2⁷ = 97161263 is a prime.

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 97161391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97161191) 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, 10566 + ... + 17491.

It is an arithmetic number, because the mean of its divisors is an integer number (24298228).

Almost surely, 2^97161391 is an apocalyptic number.

97161391 is a deficient number, since it is larger than the sum of its proper divisors (31521).

97161391 is a wasteful number, since it uses less digits than its factorization.

97161391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31520.

The product of its digits is 10206, while the sum is 37.

The square root of 97161391 is about 9857.0477831854. The cubic root of 97161391 is about 459.7247739236.

The spelling of 97161391 in words is "ninety-seven million, one hundred sixty-one thousand, three hundred ninety-one".