111541987 has 4 divisors (see below), whose sum is σ = 111568936. Its totient is φ = 111515040.

The previous prime is 111541967. The next prime is 111542021. The reversal of 111541987 is 789145111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 111541987 - 2¹⁵ = 111509219 is a prime.

It is a super-2 number, since 2×111541987² = 24883229727816338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111541967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5814 + ... + 16027.

It is an arithmetic number, because the mean of its divisors is an integer number (27892234).

Almost surely, 2^111541987 is an apocalyptic number.

111541987 is a deficient number, since it is larger than the sum of its proper divisors (26949).

111541987 is an equidigital number, since it uses as much as digits as its factorization.

111541987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26948.

The product of its digits is 10080, while the sum is 37.

The square root of 111541987 is about 10561.3439959126. The cubic root of 111541987 is about 481.3704857825.

The spelling of 111541987 in words is "one hundred eleven million, five hundred forty-one thousand, nine hundred eighty-seven".