11572409 has 4 divisors (see below), whose sum is σ = 11660880. Its totient is φ = 11483940.

The previous prime is 11572397. The next prime is 11572417. The reversal of 11572409 is 90427511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90427511 = 103 ⋅877937.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11572409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11572469) 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, 44039 + ... + 44300.

It is an arithmetic number, because the mean of its divisors is an integer number (2915220).

Almost surely, 2^11572409 is an apocalyptic number.

It is an amenable number.

11572409 is a deficient number, since it is larger than the sum of its proper divisors (88471).

11572409 is an equidigital number, since it uses as much as digits as its factorization.

11572409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88470.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 11572409 is about 3401.8243634850. The cubic root of 11572409 is about 226.1906202340.

The spelling of 11572409 in words is "eleven million, five hundred seventy-two thousand, four hundred nine".