111111197 has 2 divisors, whose sum is σ = 111111198. Its totient is φ = 111111196.

The previous prime is 111111193. The next prime is 111111199. The reversal of 111111197 is 791111111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76230361 + 34880836 = 8731^2 + 5906^2 .

It is a cyclic number.

It is not a de Polignac number, because 111111197 - 2² = 111111193 is a prime.

Together with 111111199, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111111193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55555598 + 55555599.

It is an arithmetic number, because the mean of its divisors is an integer number (55555599).

Almost surely, 2^111111197 is an apocalyptic number.

It is an amenable number.

111111197 is a deficient number, since it is larger than the sum of its proper divisors (1).

111111197 is an equidigital number, since it uses as much as digits as its factorization.

111111197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63, while the sum is 23.

The square root of 111111197 is about 10540.9296079615. The cubic root of 111111197 is about 480.7499806423.

The spelling of 111111197 in words is "one hundred eleven million, one hundred eleven thousand, one hundred ninety-seven".