11545661 has 4 divisors (see below), whose sum is σ = 11574300. Its totient is φ = 11517024.

The previous prime is 11545657. The next prime is 11545663. The reversal of 11545661 is 16654511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16654511 = 2903 ⋅5737.

It can be written as a sum of positive squares in 2 ways, for example, as 4884100 + 6661561 = 2210^2 + 2581^2 .

It is a cyclic number.

It is not a de Polignac number, because 11545661 - 2² = 11545657 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 (11545663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13706 + ... + 14523.

It is an arithmetic number, because the mean of its divisors is an integer number (2893575).

Almost surely, 2^11545661 is an apocalyptic number.

It is an amenable number.

11545661 is a deficient number, since it is larger than the sum of its proper divisors (28639).

11545661 is an equidigital number, since it uses as much as digits as its factorization.

11545661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28638.

The product of its digits is 3600, while the sum is 29.

The square root of 11545661 is about 3397.8906692241. The cubic root of 11545661 is about 226.0162164989.

The spelling of 11545661 in words is "eleven million, five hundred forty-five thousand, six hundred sixty-one".