15115225 has 6 divisors (see below), whose sum is σ = 18742910. Its totient is φ = 12092160.

The previous prime is 15115207. The next prime is 15115237. The reversal of 15115225 is 52251151.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 644809 + 14470416 = 803^2 + 3804^2 .

It is not a de Polignac number, because 15115225 - 2¹⁷ = 14984153 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15115196 and 15115205.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 302280 + ... + 302329.

Almost surely, 2^15115225 is an apocalyptic number.

It is an amenable number.

15115225 is a deficient number, since it is larger than the sum of its proper divisors (3627685).

15115225 is an equidigital number, since it uses as much as digits as its factorization.

15115225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604619 (or 604614 counting only the distinct ones).

The product of its digits is 500, while the sum is 22.

The square root of 15115225 is about 3887.8303718141. The cubic root of 15115225 is about 247.2510846429.

Adding to 15115225 its reverse (52251151), we get a palindrome (67366376).

It can be divided in two parts, 151 and 15225, that added together give a square (15376 = 124²).

The spelling of 15115225 in words is "fifteen million, one hundred fifteen thousand, two hundred twenty-five".