11185409 has 2 divisors, whose sum is σ = 11185410. Its totient is φ = 11185408.

The previous prime is 11185403. The next prime is 11185423. The reversal of 11185409 is 90458111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8850625 + 2334784 = 2975^2 + 1528^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11185409 is a prime.

It is a super-2 number, since 2×11185409² = 250226748994562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11185403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5592704 + 5592705.

It is an arithmetic number, because the mean of its divisors is an integer number (5592705).

Almost surely, 2^11185409 is an apocalyptic number.

It is an amenable number.

11185409 is a deficient number, since it is larger than the sum of its proper divisors (1).

11185409 is an equidigital number, since it uses as much as digits as its factorization.

11185409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 11185409 is about 3344.4594481022. The cubic root of 11185409 is about 223.6405867272.

The spelling of 11185409 in words is "eleven million, one hundred eighty-five thousand, four hundred nine".