111408891 has 16 divisors (see below), whose sum is σ = 162357888. Its totient is φ = 67392000.

The previous prime is 111408889. The next prime is 111408901. The reversal of 111408891 is 198804111.

It is not a de Polignac number, because 111408891 - 2¹ = 111408889 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (111408821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16116 + ... + 21966.

It is an arithmetic number, because the mean of its divisors is an integer number (10147368).

Almost surely, 2^111408891 is an apocalyptic number.

111408891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111408891 is a deficient number, since it is larger than the sum of its proper divisors (50948997).

111408891 is a wasteful number, since it uses less digits than its factorization.

111408891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6442.

The product of its (nonzero) digits is 2304, while the sum is 33.

The square root of 111408891 is about 10555.0410231320. The cubic root of 111408891 is about 481.1789465910.

The spelling of 111408891 in words is "one hundred eleven million, four hundred eight thousand, eight hundred ninety-one".