197161791 has 4 divisors (see below), whose sum is σ = 262882392. Its totient is φ = 131441192.

The previous prime is 197161777. The next prime is 197161793.

197161791 is nontrivially palindromic in base 10.

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 197161791 - 2²⁶ = 130052927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197161793) 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, 32860296 + ... + 32860301.

It is an arithmetic number, because the mean of its divisors is an integer number (65720598).

Almost surely, 2^197161791 is an apocalyptic number.

197161791 is a deficient number, since it is larger than the sum of its proper divisors (65720601).

197161791 is an equidigital number, since it uses as much as digits as its factorization.

197161791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65720600.

The product of its digits is 23814, while the sum is 42.

The square root of 197161791 is about 14041.4312304693. The cubic root of 197161791 is about 582.0240333246.

The spelling of 197161791 in words is "one hundred ninety-seven million, one hundred sixty-one thousand, seven hundred ninety-one".