11525509 has 2 divisors, whose sum is σ = 11525510. Its totient is φ = 11525508.

The previous prime is 11525497. The next prime is 11525543. The reversal of 11525509 is 90552511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8392609 + 3132900 = 2897^2 + 1770^2 .

It is a cyclic number.

It is not a de Polignac number, because 11525509 - 2⁵ = 11525477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11225509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5762754 + 5762755.

It is an arithmetic number, because the mean of its divisors is an integer number (5762755).

Almost surely, 2^11525509 is an apocalyptic number.

It is an amenable number.

11525509 is a deficient number, since it is larger than the sum of its proper divisors (1).

11525509 is an equidigital number, since it uses as much as digits as its factorization.

11525509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2250, while the sum is 28.

The square root of 11525509 is about 3394.9240050405. The cubic root of 11525509 is about 225.8846423573.

The spelling of 11525509 in words is "eleven million, five hundred twenty-five thousand, five hundred nine".