111563891 has 4 divisors (see below), whose sum is σ = 111786192. Its totient is φ = 111341592.

The previous prime is 111563873. The next prime is 111563981. The reversal of 111563891 is 198365111.

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 111563891 - 2⁶ = 111563827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111563831) 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, 110396 + ... + 111401.

It is an arithmetic number, because the mean of its divisors is an integer number (27946548).

Almost surely, 2^111563891 is an apocalyptic number.

111563891 is a deficient number, since it is larger than the sum of its proper divisors (222301).

111563891 is an equidigital number, since it uses as much as digits as its factorization.

111563891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222300.

The product of its digits is 6480, while the sum is 35.

The square root of 111563891 is about 10562.3809342402. The cubic root of 111563891 is about 481.4019933469.

The spelling of 111563891 in words is "one hundred eleven million, five hundred sixty-three thousand, eight hundred ninety-one".