11528581 has 2 divisors, whose sum is σ = 11528582. Its totient is φ = 11528580.

The previous prime is 11528563. The next prime is 11528609. The reversal of 11528581 is 18582511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11492100 + 36481 = 3390^2 + 191^2 .

It is a cyclic number.

It is not a de Polignac number, because 11528581 - 2¹¹ = 11526533 is a prime.

It is a super-2 number, since 2×11528581² = 265816359747122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11528281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5764290 + 5764291.

It is an arithmetic number, because the mean of its divisors is an integer number (5764291).

Almost surely, 2^11528581 is an apocalyptic number.

It is an amenable number.

11528581 is a deficient number, since it is larger than the sum of its proper divisors (1).

11528581 is an equidigital number, since it uses as much as digits as its factorization.

11528581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3200, while the sum is 31.

The square root of 11528581 is about 3395.3764150680. The cubic root of 11528581 is about 225.9047096121.

The spelling of 11528581 in words is "eleven million, five hundred twenty-eight thousand, five hundred eighty-one".