111920091 has 4 divisors (see below), whose sum is σ = 149226792. Its totient is φ = 74613392.

The previous prime is 111920071. The next prime is 111920117. The reversal of 111920091 is 190029111.

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 111920091 - 2¹⁵ = 111887323 is a prime.

It is a super-2 number, since 2×111920091² = 25052213538896562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (111920021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18653346 + ... + 18653351.

It is an arithmetic number, because the mean of its divisors is an integer number (37306698).

Almost surely, 2^111920091 is an apocalyptic number.

111920091 is a deficient number, since it is larger than the sum of its proper divisors (37306701).

111920091 is an equidigital number, since it uses as much as digits as its factorization.

111920091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37306700.

The product of its (nonzero) digits is 162, while the sum is 24.

The square root of 111920091 is about 10579.2292252319. The cubic root of 111920091 is about 481.9137874306.

The spelling of 111920091 in words is "one hundred eleven million, nine hundred twenty thousand, ninety-one".