16172425 has 6 divisors (see below), whose sum is σ = 20053838. Its totient is φ = 12937920.

The previous prime is 16172417. The next prime is 16172449. The reversal of 16172425 is 52427161.

It can be written as a sum of positive squares in 3 ways, for example, as 395641 + 15776784 = 629^2 + 3972^2 .

It is not a de Polignac number, because 16172425 - 2³ = 16172417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16172393 and 16172402.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 323424 + ... + 323473.

Almost surely, 2^16172425 is an apocalyptic number.

It is an amenable number.

16172425 is a deficient number, since it is larger than the sum of its proper divisors (3881413).

16172425 is an equidigital number, since it uses as much as digits as its factorization.

16172425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646907 (or 646902 counting only the distinct ones).

The product of its digits is 3360, while the sum is 28.

The square root of 16172425 is about 4021.4953686409. The cubic root of 16172425 is about 252.8861522799.

Adding to 16172425 its reverse (52427161), we get a palindrome (68599586).

The spelling of 16172425 in words is "sixteen million, one hundred seventy-two thousand, four hundred twenty-five".