111981489 has 16 divisors (see below), whose sum is σ = 152331072. Its totient is φ = 73156608.

The previous prime is 111981487. The next prime is 111981511. The reversal of 111981489 is 984189111.

It is a happy number.

It is not a de Polignac number, because 111981489 - 2¹ = 111981487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111981489.

It is not an unprimeable number, because it can be changed into a prime (111981481) 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, 34129 + ... + 37265.

It is an arithmetic number, because the mean of its divisors is an integer number (9520692).

Almost surely, 2^111981489 is an apocalyptic number.

It is an amenable number.

111981489 is a deficient number, since it is larger than the sum of its proper divisors (40349583).

111981489 is a wasteful number, since it uses less digits than its factorization.

111981489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3376.

The product of its digits is 20736, while the sum is 42.

The square root of 111981489 is about 10582.1306455742. The cubic root of 111981489 is about 482.0018953341.

The spelling of 111981489 in words is "one hundred eleven million, nine hundred eighty-one thousand, four hundred eighty-nine".