15513225 has 48 divisors (see below), whose sum is σ = 31581312. Its totient is φ = 6543360.

The previous prime is 15513209. The next prime is 15513227. The reversal of 15513225 is 52231551.

It is a happy number.

It is not a de Polignac number, because 15513225 - 2⁴ = 15513209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15513195 and 15513204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15513227) 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 47 ways as a sum of consecutive naturals, for example, 5689 + ... + 7961.

It is an arithmetic number, because the mean of its divisors is an integer number (657944).

Almost surely, 2^15513225 is an apocalyptic number.

15513225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15513225 is an abundant number, since it is smaller than the sum of its proper divisors (16068087).

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

15513225 is a wasteful number, since it uses less digits than its factorization.

15513225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2306 (or 2301 counting only the distinct ones).

The product of its digits is 1500, while the sum is 24.

The square root of 15513225 is about 3938.6831555737. The cubic root of 15513225 is about 249.4024394904.

Adding to 15513225 its reverse (52231551), we get a palindrome (67744776).

The spelling of 15513225 in words is "fifteen million, five hundred thirteen thousand, two hundred twenty-five".