111990211 has 4 divisors (see below), whose sum is σ = 112011424. Its totient is φ = 111969000.

The previous prime is 111990181. The next prime is 111990227. The reversal of 111990211 is 112099111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111990211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111990911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4246 + ... + 15556.

It is an arithmetic number, because the mean of its divisors is an integer number (28002856).

Almost surely, 2^111990211 is an apocalyptic number.

111990211 is a deficient number, since it is larger than the sum of its proper divisors (21213).

111990211 is an equidigital number, since it uses as much as digits as its factorization.

111990211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21212.

The product of its (nonzero) digits is 162, while the sum is 25.

The square root of 111990211 is about 10582.5427473741. The cubic root of 111990211 is about 482.0144090434.

Subtracting 111990211 from its reverse (112099111), we obtain a square (108900 = 330²).

The spelling of 111990211 in words is "one hundred eleven million, nine hundred ninety thousand, two hundred eleven".