111220989 has 16 divisors (see below), whose sum is σ = 162946560. Its totient is φ = 66918960.

The previous prime is 111220969. The next prime is 111220999. The reversal of 111220989 is 989022111.

It is not a de Polignac number, because 111220989 - 2⁵ = 111220957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111220969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7537 + ... + 16710.

It is an arithmetic number, because the mean of its divisors is an integer number (10184160).

Almost surely, 2^111220989 is an apocalyptic number.

It is an amenable number.

111220989 is a deficient number, since it is larger than the sum of its proper divisors (51725571).

111220989 is a wasteful number, since it uses less digits than its factorization.

111220989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24400.

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 111220989 is about 10546.1362119024. The cubic root of 111220989 is about 480.9082758984.

The spelling of 111220989 in words is "one hundred eleven million, two hundred twenty thousand, nine hundred eighty-nine".