11541609 has 20 divisors (see below), whose sum is σ = 17445780. Its totient is φ = 7603200.

The previous prime is 11541601. The next prime is 11541611. The reversal of 11541609 is 90614511.

11541609 is a `hidden beast` number, since 1 + 1 + 54 + 1 + 609 = 666.

11541609 is nontrivially palindromic in base 7.

It can be written as a sum of positive squares in 2 ways, for example, as 8037225 + 3504384 = 2835^2 + 1872^2 .

It is not a de Polignac number, because 11541609 - 2³ = 11541601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11541601) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6409 + ... + 8009.

It is an arithmetic number, because the mean of its divisors is an integer number (872289).

Almost surely, 2^11541609 is an apocalyptic number.

It is an amenable number.

11541609 is a deficient number, since it is larger than the sum of its proper divisors (5904171).

11541609 is an equidigital number, since it uses as much as digits as its factorization.

11541609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1702 (or 1693 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 11541609 is about 3397.2943646378. The cubic root of 11541609 is about 225.9897729468.

The spelling of 11541609 in words is "eleven million, five hundred forty-one thousand, six hundred nine".