111669987 has 32 divisors (see below), whose sum is σ = 176198400. Its totient is φ = 62017920.

The previous prime is 111669983. The next prime is 111670021. The reversal of 111669987 is 789966111.

It is not a de Polignac number, because 111669987 - 2² = 111669983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111669983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63048 + ... + 64794.

It is an arithmetic number, because the mean of its divisors is an integer number (5506200).

Almost surely, 2^111669987 is an apocalyptic number.

111669987 is a deficient number, since it is larger than the sum of its proper divisors (64528413).

111669987 is a wasteful number, since it uses less digits than its factorization.

111669987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1923.

The product of its digits is 163296, while the sum is 48.

The square root of 111669987 is about 10567.4020932299. The cubic root of 111669987 is about 481.5545476171.

The spelling of 111669987 in words is "one hundred eleven million, six hundred sixty-nine thousand, nine hundred eighty-seven".