12425521 has 4 divisors (see below), whose sum is σ = 13156452. Its totient is φ = 11694592.

The previous prime is 12425509. The next prime is 12425551. The reversal of 12425521 is 12552421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12552421 = 7 ⋅1793203.

It can be written as a sum of positive squares in 2 ways, for example, as 4223025 + 8202496 = 2055^2 + 2864^2 .

It is a cyclic number.

It is not a de Polignac number, because 12425521 - 2⁷ = 12425393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12425492 and 12425501.

It is not an unprimeable number, because it can be changed into a prime (12425551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365440 + ... + 365473.

It is an arithmetic number, because the mean of its divisors is an integer number (3289113).

Almost surely, 2^12425521 is an apocalyptic number.

It is an amenable number.

12425521 is a deficient number, since it is larger than the sum of its proper divisors (730931).

12425521 is an equidigital number, since it uses as much as digits as its factorization.

12425521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730930.

The product of its digits is 800, while the sum is 22.

The square root of 12425521 is about 3524.9852481961. The cubic root of 12425521 is about 231.6175886467.

Adding to 12425521 its reverse (12552421), we get a palindrome (24977942).

The spelling of 12425521 in words is "twelve million, four hundred twenty-five thousand, five hundred twenty-one".