11561906 has 12 divisors (see below), whose sum is σ = 17726478. Its totient is φ = 5655792.

The previous prime is 11561903. The next prime is 11561909. The reversal of 11561906 is 60916511.

11561906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (11561903) and next prime (11561909).

It can be written as a sum of positive squares in only one way, i.e., 6682225 + 4879681 = 2585^2 + 2209^2 .

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11561903) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3110 + ... + 5726.

Almost surely, 2^11561906 is an apocalyptic number.

11561906 is a deficient number, since it is larger than the sum of its proper divisors (6164572).

11561906 is an equidigital number, since it uses as much as digits as its factorization.

11561906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2713 (or 2666 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 11561906 is about 3400.2802825650. The cubic root of 11561906 is about 226.1221700908.

The spelling of 11561906 in words is "eleven million, five hundred sixty-one thousand, nine hundred six".