16331225 has 12 divisors (see below), whose sum is σ = 20584620. Its totient is φ = 12849600.

The previous prime is 16331221. The next prime is 16331251. The reversal of 16331225 is 52213361.

It can be written as a sum of positive squares in 6 ways, for example, as 355216 + 15976009 = 596^2 + 3997^2 .

It is not a de Polignac number, because 16331225 - 2² = 16331221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16331225.

It is not an unprimeable number, because it can be changed into a prime (16331221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3830 + ... + 6879.

It is an arithmetic number, because the mean of its divisors is an integer number (1715385).

Almost surely, 2^16331225 is an apocalyptic number.

It is an amenable number.

16331225 is a deficient number, since it is larger than the sum of its proper divisors (4253395).

16331225 is a wasteful number, since it uses less digits than its factorization.

16331225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10780 (or 10775 counting only the distinct ones).

The product of its digits is 1080, while the sum is 23.

The square root of 16331225 is about 4041.1910373057. The cubic root of 16331225 is about 253.7111696105.

Adding to 16331225 its reverse (52213361), we get a palindrome (68544586).

The spelling of 16331225 in words is "sixteen million, three hundred thirty-one thousand, two hundred twenty-five".