11056509 has 6 divisors (see below), whose sum is σ = 15970526. Its totient is φ = 7371000.

The previous prime is 11056501. The next prime is 11056517. The reversal of 11056509 is 90565011.

11056509 is a `hidden beast` number, since 1 + 1 + 0 + 5 + 650 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (11056501) and next prime (11056517).

It can be written as a sum of positive squares in only one way, i.e., 10692900 + 363609 = 3270^2 + 603^2 .

It is not a de Polignac number, because 11056509 - 2³ = 11056501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11056501) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 614242 + ... + 614259.

Almost surely, 2^11056509 is an apocalyptic number.

It is an amenable number.

11056509 is a deficient number, since it is larger than the sum of its proper divisors (4914017).

11056509 is a wasteful number, since it uses less digits than its factorization.

11056509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1228507 (or 1228504 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 27.

The square root of 11056509 is about 3325.1329296736. The cubic root of 11056509 is about 222.7781917785.

The spelling of 11056509 in words is "eleven million, fifty-six thousand, five hundred nine".