11581906 has 16 divisors (see below), whose sum is σ = 20900160. Its totient is φ = 4702320.

The previous prime is 11581901. The next prime is 11581907. The reversal of 11581906 is 60918511.

11581906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (11581901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21505 + ... + 22036.

It is an arithmetic number, because the mean of its divisors is an integer number (1306260).

Almost surely, 2^11581906 is an apocalyptic number.

11581906 is a deficient number, since it is larger than the sum of its proper divisors (9318254).

11581906 is a wasteful number, since it uses less digits than its factorization.

11581906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43569.

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 11581906 is about 3403.2199458748. The cubic root of 11581906 is about 226.2524784279.

The spelling of 11581906 in words is "eleven million, five hundred eighty-one thousand, nine hundred six".