197111197 has 4 divisors (see below), whose sum is σ = 197305276. Its totient is φ = 196917120.

The previous prime is 197111179. The next prime is 197111221. The reversal of 197111197 is 791111791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 791111791 = 103 ⋅7680697.

It can be written as a sum of positive squares in 2 ways, for example, as 98922916 + 98188281 = 9946^2 + 9909^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197111197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197111147) 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, 95508 + ... + 97549.

It is an arithmetic number, because the mean of its divisors is an integer number (49326319).

Almost surely, 2^197111197 is an apocalyptic number.

It is an amenable number.

197111197 is a deficient number, since it is larger than the sum of its proper divisors (194079).

197111197 is a wasteful number, since it uses less digits than its factorization.

197111197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194078.

The product of its digits is 3969, while the sum is 37.

The square root of 197111197 is about 14039.6295179040. The cubic root of 197111197 is about 581.9742443620.

The spelling of 197111197 in words is "one hundred ninety-seven million, one hundred eleven thousand, one hundred ninety-seven".