13505425 has 6 divisors (see below), whose sum is σ = 16746758. Its totient is φ = 10804320.

The previous prime is 13505423. The next prime is 13505431. The reversal of 13505425 is 52450531.

It can be written as a sum of positive squares in 3 ways, for example, as 952576 + 12552849 = 976^2 + 3543^2 .

It is not a de Polignac number, because 13505425 - 2¹ = 13505423 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 540217 = 13505425 / (1 + 3 + 5 + 0 + 5 + 4 + 2 + 5).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13505425.

It is not an unprimeable number, because it can be changed into a prime (13505423) 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 in 5 ways as a sum of consecutive naturals, for example, 270084 + ... + 270133.

Almost surely, 2^13505425 is an apocalyptic number.

It is an amenable number.

13505425 is a deficient number, since it is larger than the sum of its proper divisors (3241333).

13505425 is an equidigital number, since it uses as much as digits as its factorization.

13505425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540227 (or 540222 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 13505425 is about 3674.9727890149. The cubic root of 13505425 is about 238.1420485264.

Adding to 13505425 its reverse (52450531), we get a palindrome (65955956).

The spelling of 13505425 in words is "thirteen million, five hundred five thousand, four hundred twenty-five".