11579661 has 6 divisors (see below), whose sum is σ = 16726190. Its totient is φ = 7719768.

The previous prime is 11579641. The next prime is 11579663. The reversal of 11579661 is 16697511.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 9418761 + 2160900 = 3069^2 + 1470^2 .

It is not a de Polignac number, because 11579661 - 2⁵ = 11579629 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 (11579663) 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, 643306 + ... + 643323.

Almost surely, 2^11579661 is an apocalyptic number.

It is an amenable number.

11579661 is a deficient number, since it is larger than the sum of its proper divisors (5146529).

11579661 is a wasteful number, since it uses less digits than its factorization.

11579661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1286635 (or 1286632 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 11579661 is about 3402.8900951985. The cubic root of 11579661 is about 226.2378587952.

The spelling of 11579661 in words is "eleven million, five hundred seventy-nine thousand, six hundred sixty-one".