111959559 has 6 divisors (see below), whose sum is σ = 161719376. Its totient is φ = 74639700.

The previous prime is 111959539. The next prime is 111959581. The reversal of 111959559 is 955959111.

111959559 is a `hidden beast` number, since 1 + 1 + 1 + 9 + 595 + 59 = 666.

It is not a de Polignac number, because 111959559 - 2⁵ = 111959527 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 (111959509) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6219967 + ... + 6219984.

Almost surely, 2^111959559 is an apocalyptic number.

111959559 is a deficient number, since it is larger than the sum of its proper divisors (49759817).

111959559 is a wasteful number, since it uses less digits than its factorization.

111959559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12439957 (or 12439954 counting only the distinct ones).

The product of its digits is 91125, while the sum is 45.

The square root of 111959559 is about 10581.0944140954. The cubic root of 111959559 is about 481.9704288487.

The spelling of 111959559 in words is "one hundred eleven million, nine hundred fifty-nine thousand, five hundred fifty-nine".