13225518 has 56 divisors (see below), whose sum is σ = 30534048. Its totient is φ = 4292352.

The previous prime is 13225517. The next prime is 13225549. The reversal of 13225518 is 81552231.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13225491 and 13225500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13225517) 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 27 ways as a sum of consecutive naturals, for example, 68430 + ... + 68622.

It is a vampire number, since it can be written as 2538 ⋅ 5211 (with its own digits).

Almost surely, 2^13225518 is an apocalyptic number.

13225518 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 13225518, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15267024).

13225518 is an abundant number, since it is smaller than the sum of its proper divisors (17308530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13225518 is an equidigital number, since it uses as much as digits as its factorization.

13225518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260 (or 245 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 13225518 is about 3636.6905284888. The cubic root of 13225518 is about 236.4853437125.

Adding to 13225518 its reverse (81552231), we get a palindrome (94777749).

The spelling of 13225518 in words is "thirteen million, two hundred twenty-five thousand, five hundred eighteen".