16171225 has 36 divisors (see below), whose sum is σ = 23946384. Its totient is φ = 10795680.

The previous prime is 16171219. The next prime is 16171229. The reversal of 16171225 is 52217161.

It is not a de Polignac number, because 16171225 - 2³ = 16171217 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 16171225.

It is not an unprimeable number, because it can be changed into a prime (16171229) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 52522 + ... + 52828.

Almost surely, 2^16171225 is an apocalyptic number.

It is an amenable number.

16171225 is a deficient number, since it is larger than the sum of its proper divisors (7775159).

16171225 is a wasteful number, since it uses less digits than its factorization.

16171225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374 (or 362 counting only the distinct ones).

The product of its digits is 840, while the sum is 25.

The square root of 16171225 is about 4021.3461676409. The cubic root of 16171225 is about 252.8798973760.

Adding to 16171225 its reverse (52217161), we get a palindrome (68388386).

The spelling of 16171225 in words is "sixteen million, one hundred seventy-one thousand, two hundred twenty-five".