23198111 has 2 divisors, whose sum is σ = 23198112. Its totient is φ = 23198110.

The previous prime is 23198093. The next prime is 23198167. The reversal of 23198111 is 11189132.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23198111 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23198171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11599055 + 11599056.

It is an arithmetic number, because the mean of its divisors is an integer number (11599056).

Almost surely, 2^23198111 is an apocalyptic number.

23198111 is a deficient number, since it is larger than the sum of its proper divisors (1).

23198111 is an equidigital number, since it uses as much as digits as its factorization.

23198111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 26.

The square root of 23198111 is about 4816.4417363859. The cubic root of 23198111 is about 285.2008884267.

The spelling of 23198111 in words is "twenty-three million, one hundred ninety-eight thousand, one hundred eleven".