11199581 has 2 divisors, whose sum is σ = 11199582. Its totient is φ = 11199580.

The previous prime is 11199577. The next prime is 11199623. The reversal of 11199581 is 18599111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6046681 + 5152900 = 2459^2 + 2270^2 .

It is a cyclic number.

It is not a de Polignac number, because 11199581 - 2² = 11199577 is a prime.

It is a super-2 number, since 2×11199581² = 250861229151122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11199541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5599790 + 5599791.

It is an arithmetic number, because the mean of its divisors is an integer number (5599791).

Almost surely, 2^11199581 is an apocalyptic number.

It is an amenable number.

11199581 is a deficient number, since it is larger than the sum of its proper divisors (1).

11199581 is an equidigital number, since it uses as much as digits as its factorization.

11199581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 35.

The square root of 11199581 is about 3346.5775054524. The cubic root of 11199581 is about 223.7349983180.

The spelling of 11199581 in words is "eleven million, one hundred ninety-nine thousand, five hundred eighty-one".