111198523 has 2 divisors, whose sum is σ = 111198524. Its totient is φ = 111198522.

The previous prime is 111198517. The next prime is 111198553. The reversal of 111198523 is 325891111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111198523 - 2²¹ = 109101371 is a prime.

It is a super-2 number, since 2×111198523² = 24730223034763058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111198553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55599261 + 55599262.

It is an arithmetic number, because the mean of its divisors is an integer number (55599262).

Almost surely, 2^111198523 is an apocalyptic number.

111198523 is a deficient number, since it is larger than the sum of its proper divisors (1).

111198523 is an equidigital number, since it uses as much as digits as its factorization.

111198523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 31.

The square root of 111198523 is about 10545.0710286844. The cubic root of 111198523 is about 480.8758934828.

The spelling of 111198523 in words is "one hundred eleven million, one hundred ninety-eight thousand, five hundred twenty-three".