16172725 has 6 divisors (see below), whose sum is σ = 20054210. Its totient is φ = 12938160.

The previous prime is 16172707. The next prime is 16172759. The reversal of 16172725 is 52727161.

It can be written as a sum of positive squares in 3 ways, for example, as 3598609 + 12574116 = 1897^2 + 3546^2 .

It is not a de Polignac number, because 16172725 - 2⁵ = 16172693 is a prime.

It is a congruent number.

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, 323430 + ... + 323479.

Almost surely, 2^16172725 is an apocalyptic number.

It is an amenable number.

16172725 is a deficient number, since it is larger than the sum of its proper divisors (3881485).

16172725 is an equidigital number, since it uses as much as digits as its factorization.

16172725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646919 (or 646914 counting only the distinct ones).

The product of its digits is 5880, while the sum is 31.

The square root of 16172725 is about 4021.5326680260. The cubic root of 16172725 is about 252.8877159575.

Adding to 16172725 its reverse (52727161), we get a palindrome (68899886).

The spelling of 16172725 in words is "sixteen million, one hundred seventy-two thousand, seven hundred twenty-five".