11552581 has 2 divisors, whose sum is σ = 11552582. Its totient is φ = 11552580.

The previous prime is 11552561. The next prime is 11552591. The reversal of 11552581 is 18525511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10857025 + 695556 = 3295^2 + 834^2 .

It is a cyclic number.

It is not a de Polignac number, because 11552581 - 2⁵ = 11552549 is a prime.

It is a super-2 number, since 2×11552581² = 266924255523122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11552501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5776290 + 5776291.

It is an arithmetic number, because the mean of its divisors is an integer number (5776291).

Almost surely, 2^11552581 is an apocalyptic number.

It is an amenable number.

11552581 is a deficient number, since it is larger than the sum of its proper divisors (1).

11552581 is an equidigital number, since it uses as much as digits as its factorization.

11552581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2000, while the sum is 28.

The square root of 11552581 is about 3398.9087954813. The cubic root of 11552581 is about 226.0613624590.

The spelling of 11552581 in words is "eleven million, five hundred fifty-two thousand, five hundred eighty-one".