11801911 has 4 divisors (see below), whose sum is σ = 12874824. Its totient is φ = 10729000.

The previous prime is 11801899. The next prime is 11801939. The reversal of 11801911 is 11910811.

11801911 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11910811 = 11 ⋅1082801.

It is a cyclic number.

It is not a de Polignac number, because 11801911 - 2⁵ = 11801879 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11801941) 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, 536440 + ... + 536461.

It is an arithmetic number, because the mean of its divisors is an integer number (3218706).

Almost surely, 2^11801911 is an apocalyptic number.

11801911 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11801911 is a deficient number, since it is larger than the sum of its proper divisors (1072913).

11801911 is a wasteful number, since it uses less digits than its factorization.

11801911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072912.

The product of its (nonzero) digits is 72, while the sum is 22.

The square root of 11801911 is about 3435.3909530067. The cubic root of 11801911 is about 227.6761008200.

Subtracting 11801911 from its reverse (11910811), we obtain a square (108900 = 330²).

The spelling of 11801911 in words is "eleven million, eight hundred one thousand, nine hundred eleven".