11881585 has 4 divisors (see below), whose sum is σ = 14257908. Its totient is φ = 9505264.

The previous prime is 11881577. The next prime is 11881591. The reversal of 11881585 is 58518811.

11881585 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3810304 + 8071281 = 1952^2 + 2841^2 .

It is a cyclic number.

It is not a de Polignac number, because 11881585 - 2³ = 11881577 is a prime.

It is a super-2 number, since 2×11881585² = 282344124224450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1188154 + ... + 1188163.

It is an arithmetic number, because the mean of its divisors is an integer number (3564477).

Almost surely, 2^11881585 is an apocalyptic number.

It is an amenable number.

11881585 is a deficient number, since it is larger than the sum of its proper divisors (2376323).

11881585 is an equidigital number, since it uses as much as digits as its factorization.

11881585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2376322.

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

The square root of 11881585 is about 3446.9675078248. The cubic root of 11881585 is about 228.1872948033.

The spelling of 11881585 in words is "eleven million, eight hundred eighty-one thousand, five hundred eighty-five".