11571409 has 4 divisors (see below), whose sum is σ = 11605104. Its totient is φ = 11537716.

The previous prime is 11571383. The next prime is 11571419. The reversal of 11571409 is 90417511.

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.

It is a cyclic number.

It is not a de Polignac number, because 11571409 - 2¹¹ = 11569361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11571419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16327 + ... + 17020.

It is an arithmetic number, because the mean of its divisors is an integer number (2901276).

Almost surely, 2^11571409 is an apocalyptic number.

It is an amenable number.

11571409 is a deficient number, since it is larger than the sum of its proper divisors (33695).

11571409 is an equidigital number, since it uses as much as digits as its factorization.

11571409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33694.

The product of its (nonzero) digits is 1260, while the sum is 28.

The square root of 11571409 is about 3401.6773803522. The cubic root of 11571409 is about 226.1841048192.

The spelling of 11571409 in words is "eleven million, five hundred seventy-one thousand, four hundred nine".