111985989 has 4 divisors (see below), whose sum is σ = 149314656. Its totient is φ = 74657324.

The previous prime is 111985969. The next prime is 111985997. The reversal of 111985989 is 989589111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 111985989 - 2¹⁶ = 111920453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111985949) 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, 18664329 + ... + 18664334.

It is an arithmetic number, because the mean of its divisors is an integer number (37328664).

Almost surely, 2^111985989 is an apocalyptic number.

It is an amenable number.

111985989 is a deficient number, since it is larger than the sum of its proper divisors (37328667).

111985989 is an equidigital number, since it uses as much as digits as its factorization.

111985989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37328666.

The product of its digits is 233280, while the sum is 51.

The square root of 111985989 is about 10582.3432660257. The cubic root of 111985989 is about 482.0083516973.

The spelling of 111985989 in words is "one hundred eleven million, nine hundred eighty-five thousand, nine hundred eighty-nine".