11566901 has 4 divisors (see below), whose sum is σ = 11573772. Its totient is φ = 11560032.

The previous prime is 11566897. The next prime is 11566913. The reversal of 11566901 is 10966511.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 9394225 + 2172676 = 3065^2 + 1474^2 .

It is a cyclic number.

It is not a de Polignac number, because 11566901 - 2² = 11566897 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11566931) 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, 995 + ... + 4911.

It is an arithmetic number, because the mean of its divisors is an integer number (2893443).

Almost surely, 2^11566901 is an apocalyptic number.

It is an amenable number.

11566901 is a deficient number, since it is larger than the sum of its proper divisors (6871).

11566901 is an equidigital number, since it uses as much as digits as its factorization.

11566901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6870.

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

The square root of 11566901 is about 3401.0147015266. The cubic root of 11566901 is about 226.1547286679.

The spelling of 11566901 in words is "eleven million, five hundred sixty-six thousand, nine hundred one".