11581885 has 24 divisors (see below), whose sum is σ = 16576056. Its totient is φ = 7741440.

The previous prime is 11581853. The next prime is 11581901. The reversal of 11581885 is 58818511.

It can be written as a sum of positive squares in 4 ways, for example, as 432964 + 11148921 = 658^2 + 3339^2 .

It is not a de Polignac number, because 11581885 - 2⁵ = 11581853 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9469 + ... + 10621.

It is an arithmetic number, because the mean of its divisors is an integer number (690669).

Almost surely, 2^11581885 is an apocalyptic number.

It is an amenable number.

11581885 is a deficient number, since it is larger than the sum of its proper divisors (4994171).

11581885 is a wasteful number, since it uses less digits than its factorization.

11581885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1213 (or 1206 counting only the distinct ones).

The product of its digits is 12800, while the sum is 37.

The square root of 11581885 is about 3403.2168605600. The cubic root of 11581885 is about 226.2523416829.

The spelling of 11581885 in words is "eleven million, five hundred eighty-one thousand, eight hundred eighty-five".