13525409 has 2 divisors, whose sum is σ = 13525410. Its totient is φ = 13525408.

The previous prime is 13525399. The next prime is 13525411. The reversal of 13525409 is 90452531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12271009 + 1254400 = 3503^2 + 1120^2 .

It is a cyclic number.

It is not a de Polignac number, because 13525409 - 2⁸ = 13525153 is a prime.

It is a Sophie Germain prime.

Together with 13525411, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (13525009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6762704 + 6762705.

It is an arithmetic number, because the mean of its divisors is an integer number (6762705).

Almost surely, 2^13525409 is an apocalyptic number.

It is an amenable number.

13525409 is a deficient number, since it is larger than the sum of its proper divisors (1).

13525409 is an equidigital number, since it uses as much as digits as its factorization.

13525409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 13525409 is about 3677.6907156530. The cubic root of 13525409 is about 238.2594503683.

The spelling of 13525409 in words is "thirteen million, five hundred twenty-five thousand, four hundred nine".