11571609 has 16 divisors (see below), whose sum is σ = 18241920. Its totient is φ = 6384000.

The previous prime is 11571559. The next prime is 11571613. The reversal of 11571609 is 90617511.

It is not a de Polignac number, because 11571609 - 2⁷ = 11571481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11571619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8892 + ... + 10109.

It is an arithmetic number, because the mean of its divisors is an integer number (1140120).

Almost surely, 2^11571609 is an apocalyptic number.

It is an amenable number.

11571609 is a deficient number, since it is larger than the sum of its proper divisors (6670311).

11571609 is a wasteful number, since it uses less digits than its factorization.

11571609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19040.

The product of its (nonzero) digits is 1890, while the sum is 30.

The square root of 11571609 is about 3401.7067774869. The cubic root of 11571609 is about 226.1854079322.

The spelling of 11571609 in words is "eleven million, five hundred seventy-one thousand, six hundred nine".