16315225 has 6 divisors (see below), whose sum is σ = 20230910. Its totient is φ = 13052160.

The previous prime is 16315217. The next prime is 16315231. The reversal of 16315225 is 52251361.

It can be written as a sum of positive squares in 3 ways, for example, as 1996569 + 14318656 = 1413^2 + 3784^2 .

It is not a de Polignac number, because 16315225 - 2³ = 16315217 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: 652609 = 16315225 / (1 + 6 + 3 + 1 + 5 + 2 + 2 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 16315225.

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, 326280 + ... + 326329.

Almost surely, 2^16315225 is an apocalyptic number.

It is an amenable number.

16315225 is a deficient number, since it is larger than the sum of its proper divisors (3915685).

16315225 is an equidigital number, since it uses as much as digits as its factorization.

16315225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652619 (or 652614 counting only the distinct ones).

The product of its digits is 1800, while the sum is 25.

The square root of 16315225 is about 4039.2109377947. The cubic root of 16315225 is about 253.6282873789.

Adding to 16315225 its reverse (52251361), we get a palindrome (68566586).

The spelling of 16315225 in words is "sixteen million, three hundred fifteen thousand, two hundred twenty-five".