11583581 has 2 divisors, whose sum is σ = 11583582. Its totient is φ = 11583580.

The previous prime is 11583571. The next prime is 11583601. The reversal of 11583581 is 18538511.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7344100 + 4239481 = 2710^2 + 2059^2 .

It is a cyclic number.

It is not a de Polignac number, because 11583581 - 2¹⁸ = 11321437 is a prime.

It is a super-2 number, since 2×11583581² = 268358697567122, 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 (11583541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5791790 + 5791791.

It is an arithmetic number, because the mean of its divisors is an integer number (5791791).

Almost surely, 2^11583581 is an apocalyptic number.

It is an amenable number.

11583581 is a deficient number, since it is larger than the sum of its proper divisors (1).

11583581 is an equidigital number, since it uses as much as digits as its factorization.

11583581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4800, while the sum is 32.

The square root of 11583581 is about 3403.4660274491. The cubic root of 11583581 is about 226.2633849412.

The spelling of 11583581 in words is "eleven million, five hundred eighty-three thousand, five hundred eighty-one".