11845581 has 16 divisors (see below), whose sum is σ = 17290560. Its totient is φ = 7153920.

The previous prime is 11845579. The next prime is 11845591. The reversal of 11845581 is 18554811.

11845581 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11845581 - 2¹ = 11845579 is a prime.

It is a super-2 number, since 2×11845581² = 280635578455122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11845571) 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, 13875 + ... + 14703.

It is an arithmetic number, because the mean of its divisors is an integer number (1080660).

Almost surely, 2^11845581 is an apocalyptic number.

11845581 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11845581 is a deficient number, since it is larger than the sum of its proper divisors (5444979).

11845581 is a wasteful number, since it uses less digits than its factorization.

11845581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1276.

The product of its digits is 6400, while the sum is 33.

The square root of 11845581 is about 3441.7409838627. The cubic root of 11845581 is about 227.9565745243.

The spelling of 11845581 in words is "eleven million, eight hundred forty-five thousand, five hundred eighty-one".