11550891 has 16 divisors (see below), whose sum is σ = 16858368. Its totient is φ = 6976800.

The previous prime is 11550859. The next prime is 11550901. The reversal of 11550891 is 19805511.

It is not a de Polignac number, because 11550891 - 2⁵ = 11550859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11550811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17530 + ... + 18176.

It is an arithmetic number, because the mean of its divisors is an integer number (1053648).

Almost surely, 2^11550891 is an apocalyptic number.

11550891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11550891 is a deficient number, since it is larger than the sum of its proper divisors (5307477).

11550891 is a wasteful number, since it uses less digits than its factorization.

11550891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202.

The product of its (nonzero) digits is 1800, while the sum is 30.

The square root of 11550891 is about 3398.6601771875. The cubic root of 11550891 is about 226.0503385924.

The spelling of 11550891 in words is "eleven million, five hundred fifty thousand, eight hundred ninety-one".