11525581 has 2 divisors, whose sum is σ = 11525582. Its totient is φ = 11525580.

The previous prime is 11525561. The next prime is 11525593. The reversal of 11525581 is 18552511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9302500 + 2223081 = 3050^2 + 1491^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11525581 is a prime.

It is a super-2 number, since 2×11525581² = 265678034775122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11525561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5762790 + 5762791.

It is an arithmetic number, because the mean of its divisors is an integer number (5762791).

Almost surely, 2^11525581 is an apocalyptic number.

It is an amenable number.

11525581 is a deficient number, since it is larger than the sum of its proper divisors (1).

11525581 is an equidigital number, since it uses as much as digits as its factorization.

11525581 is an odious number, because the sum of its binary digits is odd.

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

The square root of 11525581 is about 3394.9346090904. The cubic root of 11525581 is about 225.8851127244.

The spelling of 11525581 in words is "eleven million, five hundred twenty-five thousand, five hundred eighty-one".