11900111 has 4 divisors (see below), whose sum is σ = 11913552. Its totient is φ = 11886672.

The previous prime is 11900107. The next prime is 11900149. The reversal of 11900111 is 11100911.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11100911 = 181 ⋅61331.

It is a cyclic number.

It is not a de Polignac number, because 11900111 - 2² = 11900107 is a prime.

It is a super-2 number, since 2×11900111² = 283225283624642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11900711) 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, 5291 + ... + 7196.

It is an arithmetic number, because the mean of its divisors is an integer number (2978388).

Almost surely, 2^11900111 is an apocalyptic number.

11900111 is a deficient number, since it is larger than the sum of its proper divisors (13441).

11900111 is an equidigital number, since it uses as much as digits as its factorization.

11900111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13440.

The product of its (nonzero) digits is 9, while the sum is 14.

The square root of 11900111 is about 3449.6537507408. The cubic root of 11900111 is about 228.3058312493.

The spelling of 11900111 in words is "eleven million, nine hundred thousand, one hundred eleven".