16225225 has 12 divisors (see below), whose sum is σ = 21303324. Its totient is φ = 12216320.

The previous prime is 16225213. The next prime is 16225241. The reversal of 16225225 is 52252261.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1317904 + 14907321 = 1148^2 + 3861^2 .

It is not a de Polignac number, because 16225225 - 2⁵ = 16225193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16225225.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18664 + ... + 19513.

It is an arithmetic number, because the mean of its divisors is an integer number (1775277).

Almost surely, 2^16225225 is an apocalyptic number.

It is an amenable number.

16225225 is a deficient number, since it is larger than the sum of its proper divisors (5078099).

16225225 is a wasteful number, since it uses less digits than its factorization.

16225225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38204 (or 38199 counting only the distinct ones).

The product of its digits is 2400, while the sum is 25.

The square root of 16225225 is about 4028.0547414354. The cubic root of 16225225 is about 253.1610622806.

Adding to 16225225 its reverse (52252261), we get a palindrome (68477486).

It can be divided in two parts, 1 and 6225225, that added together give a palindrome (6225226).

The spelling of 16225225 in words is "sixteen million, two hundred twenty-five thousand, two hundred twenty-five".