111591889 has 4 divisors (see below), whose sum is σ = 114607924. Its totient is φ = 108575856.

The previous prime is 111591881. The next prime is 111591901. The reversal of 111591889 is 988195111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51265600 + 60326289 = 7160^2 + 7767^2 .

It is a cyclic number.

It is not a de Polignac number, because 111591889 - 2³ = 111591881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111591881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1507962 + ... + 1508035.

It is an arithmetic number, because the mean of its divisors is an integer number (28651981).

Almost surely, 2^111591889 is an apocalyptic number.

It is an amenable number.

111591889 is a deficient number, since it is larger than the sum of its proper divisors (3016035).

111591889 is an equidigital number, since it uses as much as digits as its factorization.

111591889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3016034.

The product of its digits is 25920, while the sum is 43.

The square root of 111591889 is about 10563.7062151501. The cubic root of 111591889 is about 481.4422607534.

The spelling of 111591889 in words is "one hundred eleven million, five hundred ninety-one thousand, eight hundred eighty-nine".