111509987 has 8 divisors (see below), whose sum is σ = 118533456. Its totient is φ = 104538112.

The previous prime is 111509929. The next prime is 111509989. The reversal of 111509987 is 789905111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 111509987 - 2²² = 107315683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111509989) 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 7 ways as a sum of consecutive naturals, for example, 8393 + ... + 17130.

It is an arithmetic number, because the mean of its divisors is an integer number (14816682).

Almost surely, 2^111509987 is an apocalyptic number.

111509987 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

111509987 is a deficient number, since it is larger than the sum of its proper divisors (7023469).

111509987 is a wasteful number, since it uses less digits than its factorization.

111509987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25797.

The product of its (nonzero) digits is 22680, while the sum is 41.

The square root of 111509987 is about 10559.8289285386. The cubic root of 111509987 is about 481.3244483239.

The spelling of 111509987 in words is "one hundred eleven million, five hundred nine thousand, nine hundred eighty-seven".