111980091 has 32 divisors (see below), whose sum is σ = 163840000. Its totient is φ = 67767840.

The previous prime is 111980087. The next prime is 111980111. The reversal of 111980091 is 190089111.

It is a happy number.

It is not a de Polignac number, because 111980091 - 2² = 111980087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111980191) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 224160 + ... + 224658.

It is an arithmetic number, because the mean of its divisors is an integer number (5120000).

Almost surely, 2^111980091 is an apocalyptic number.

111980091 is a deficient number, since it is larger than the sum of its proper divisors (51859909).

111980091 is a wasteful number, since it uses less digits than its factorization.

111980091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679.

The product of its (nonzero) digits is 648, while the sum is 30.

The square root of 111980091 is about 10582.0645906175. The cubic root of 111980091 is about 481.9998895221. Note that the first 3 decimals are identical.

The spelling of 111980091 in words is "one hundred eleven million, nine hundred eighty thousand, ninety-one".