11788581 has 16 divisors (see below), whose sum is σ = 18745344. Its totient is φ = 6443184.

The previous prime is 11788571. The next prime is 11788589. The reversal of 11788581 is 18588711.

11788581 is digitally balanced in base 2, base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11788581 - 2⁵ = 11788549 is a prime.

It is a super-2 number, since 2×11788581² = 277941283987122, which contains 22 as substring.

It is a Curzon number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11788589) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11721 + ... + 12686.

It is an arithmetic number, because the mean of its divisors is an integer number (1171584).

Almost surely, 2^11788581 is an apocalyptic number.

It is an amenable number.

11788581 is a deficient number, since it is larger than the sum of its proper divisors (6956763).

11788581 is a wasteful number, since it uses less digits than its factorization.

11788581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24440.

The product of its digits is 17920, while the sum is 39.

The square root of 11788581 is about 3433.4503054508. The cubic root of 11788581 is about 227.5903501375.

The spelling of 11788581 in words is "eleven million, seven hundred eighty-eight thousand, five hundred eighty-one".