11813911 has 4 divisors (see below), whose sum is σ = 11823192. Its totient is φ = 11804632.

The previous prime is 11813899. The next prime is 11813917. The reversal of 11813911 is 11931811.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 11813911 - 2¹³ = 11805719 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 (11813917) 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, 2356 + ... + 5401.

It is an arithmetic number, because the mean of its divisors is an integer number (2955798).

Almost surely, 2^11813911 is an apocalyptic number.

11813911 is a deficient number, since it is larger than the sum of its proper divisors (9281).

11813911 is an equidigital number, since it uses as much as digits as its factorization.

11813911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9280.

The product of its digits is 216, while the sum is 25.

The square root of 11813911 is about 3437.1370353828. The cubic root of 11813911 is about 227.7532405234.

The spelling of 11813911 in words is "eleven million, eight hundred thirteen thousand, nine hundred eleven".