11589581 has 4 divisors (see below), whose sum is σ = 11596992. Its totient is φ = 11582172.

The previous prime is 11589559. The next prime is 11589607. The reversal of 11589581 is 18598511.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 11589581 - 2⁶ = 11589517 is a prime.

It is a super-2 number, since 2×11589581² = 268636775511122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11589521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 341 + ... + 4826.

It is an arithmetic number, because the mean of its divisors is an integer number (2899248).

Almost surely, 2^11589581 is an apocalyptic number.

It is an amenable number.

11589581 is a deficient number, since it is larger than the sum of its proper divisors (7411).

11589581 is an equidigital number, since it uses as much as digits as its factorization.

11589581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7410.

The product of its digits is 14400, while the sum is 38.

The square root of 11589581 is about 3404.3473677050. The cubic root of 11589581 is about 226.3024444220.

The spelling of 11589581 in words is "eleven million, five hundred eighty-nine thousand, five hundred eighty-one".