11855911 has 2 divisors, whose sum is σ = 11855912. Its totient is φ = 11855910.

The previous prime is 11855903. The next prime is 11855933. The reversal of 11855911 is 11955811.

11855911 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11855911 - 2³ = 11855903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11855111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5927955 + 5927956.

It is an arithmetic number, because the mean of its divisors is an integer number (5927956).

Almost surely, 2^11855911 is an apocalyptic number.

11855911 is a deficient number, since it is larger than the sum of its proper divisors (1).

11855911 is an equidigital number, since it uses as much as digits as its factorization.

11855911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 31.

The square root of 11855911 is about 3443.2413508205. The cubic root of 11855911 is about 228.0228188406.

The spelling of 11855911 in words is "eleven million, eight hundred fifty-five thousand, nine hundred eleven".