111971887 has 4 divisors (see below), whose sum is σ = 112075056. Its totient is φ = 111868720.

The previous prime is 111971863. The next prime is 111971903. The reversal of 111971887 is 788179111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 788179111 = 23 ⋅34268657.

It is a cyclic number.

It is not a de Polignac number, because 111971887 - 2⁷ = 111971759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111971837) 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, 49939 + ... + 52132.

It is an arithmetic number, because the mean of its divisors is an integer number (28018764).

Almost surely, 2^111971887 is an apocalyptic number.

111971887 is a deficient number, since it is larger than the sum of its proper divisors (103169).

111971887 is a wasteful number, since it uses less digits than its factorization.

111971887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103168.

The product of its digits is 28224, while the sum is 43.

The square root of 111971887 is about 10581.6769464958. The cubic root of 111971887 is about 481.9881183116.

The spelling of 111971887 in words is "one hundred eleven million, nine hundred seventy-one thousand, eight hundred eighty-seven".