11664891 has 30 divisors (see below), whose sum is σ = 20277180. Its totient is φ = 6663384.

The previous prime is 11664881. The next prime is 11664899. The reversal of 11664891 is 19846611.

It is a happy number.

11664891 is a `hidden beast` number, since 1 + 1 + 6 + 648 + 9 + 1 = 666.

It is not a de Polignac number, because 11664891 - 2⁶ = 11664827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11664899) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 2500 + ... + 5438.

It is an arithmetic number, because the mean of its divisors is an integer number (675906).

Almost surely, 2^11664891 is an apocalyptic number.

11664891 is a deficient number, since it is larger than the sum of its proper divisors (8612289).

11664891 is an equidigital number, since it uses as much as digits as its factorization.

11664891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2965 (or 2949 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 11664891 is about 3415.3903144443. The cubic root of 11664891 is about 226.7915634722.

The spelling of 11664891 in words is "eleven million, six hundred sixty-four thousand, eight hundred ninety-one".