11256409 has 4 divisors (see below), whose sum is σ = 11274880. Its totient is φ = 11237940.

The previous prime is 11256403. The next prime is 11256439. The reversal of 11256409 is 90465211.

11256409 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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: 90465211 = 17 ⋅5321483.

It is a cyclic number.

It is not a de Polignac number, because 11256409 - 2⁷ = 11256281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11256403) 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, 8289 + ... + 9550.

It is an arithmetic number, because the mean of its divisors is an integer number (2818720).

Almost surely, 2^11256409 is an apocalyptic number.

It is an amenable number.

11256409 is a deficient number, since it is larger than the sum of its proper divisors (18471).

11256409 is an equidigital number, since it uses as much as digits as its factorization.

11256409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18470.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 11256409 is about 3355.0572275298. The cubic root of 11256409 is about 224.1127793585.

The spelling of 11256409 in words is "eleven million, two hundred fifty-six thousand, four hundred nine".