111891913 has 16 divisors (see below), whose sum is σ = 131235840. Its totient is φ = 93408336.

The previous prime is 111891883. The next prime is 111891917. The reversal of 111891913 is 319198111.

It is a de Polignac number, because none of the positive numbers 2^k-111891913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111891917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77920 + ... + 79342.

It is an arithmetic number, because the mean of its divisors is an integer number (8202240).

Almost surely, 2^111891913 is an apocalyptic number.

It is an amenable number.

111891913 is a deficient number, since it is larger than the sum of its proper divisors (19343927).

111891913 is a wasteful number, since it uses less digits than its factorization.

111891913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1716.

The product of its digits is 1944, while the sum is 34.

The square root of 111891913 is about 10577.8973808598. The cubic root of 111891913 is about 481.8733403987.

The spelling of 111891913 in words is "one hundred eleven million, eight hundred ninety-one thousand, nine hundred thirteen".