11855211 has 4 divisors (see below), whose sum is σ = 15806952. Its totient is φ = 7903472.

The previous prime is 11855177. The next prime is 11855213. The reversal of 11855211 is 11255811.

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

It is a cyclic number.

It is not a de Polignac number, because 11855211 - 2⁶ = 11855147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11855213) 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, 1975866 + ... + 1975871.

It is an arithmetic number, because the mean of its divisors is an integer number (3951738).

Almost surely, 2^11855211 is an apocalyptic number.

11855211 is a deficient number, since it is larger than the sum of its proper divisors (3951741).

11855211 is an equidigital number, since it uses as much as digits as its factorization.

11855211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3951740.

The product of its digits is 400, while the sum is 24.

The square root of 11855211 is about 3443.1397009125. The cubic root of 11855211 is about 228.0183310900.

The spelling of 11855211 in words is "eleven million, eight hundred fifty-five thousand, two hundred eleven".