111213991 has 8 divisors (see below), whose sum is σ = 127166624. Its totient is φ = 95277600.

The previous prime is 111213961. The next prime is 111214003. The reversal of 111213991 is 199312111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 111213991 - 2⁵ = 111213959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111213961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20701 + ... + 25513.

It is an arithmetic number, because the mean of its divisors is an integer number (15895828).

Almost surely, 2^111213991 is an apocalyptic number.

111213991 is a deficient number, since it is larger than the sum of its proper divisors (15952633).

111213991 is an equidigital number, since it uses as much as digits as its factorization.

111213991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8121.

The product of its digits is 486, while the sum is 28.

The square root of 111213991 is about 10545.8044264058. The cubic root of 111213991 is about 480.8981894727.

The spelling of 111213991 in words is "one hundred eleven million, two hundred thirteen thousand, nine hundred ninety-one".