11520891 has 12 divisors (see below), whose sum is σ = 16684200. Its totient is φ = 7660800.

The previous prime is 11520889. The next prime is 11520911. The reversal of 11520891 is 19802511.

It is not a de Polignac number, because 11520891 - 2¹ = 11520889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11520881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2616 + ... + 5466.

It is an arithmetic number, because the mean of its divisors is an integer number (1390350).

Almost surely, 2^11520891 is an apocalyptic number.

11520891 is a deficient number, since it is larger than the sum of its proper divisors (5163309).

11520891 is a wasteful number, since it uses less digits than its factorization.

11520891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3306 (or 3303 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 11520891 is about 3394.2438038538. The cubic root of 11520891 is about 225.8544694418.

The spelling of 11520891 in words is "eleven million, five hundred twenty thousand, eight hundred ninety-one".