16217725 has 6 divisors (see below), whose sum is σ = 20110010. Its totient is φ = 12974160.

The previous prime is 16217713. The next prime is 16217731. The reversal of 16217725 is 52771261.

It can be written as a sum of positive squares in 3 ways, for example, as 49284 + 16168441 = 222^2 + 4021^2 .

It is not a de Polignac number, because 16217725 - 2¹¹ = 16215677 is a prime.

It is a plaindrome in base 14.

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, 324330 + ... + 324379.

Almost surely, 2^16217725 is an apocalyptic number.

It is an amenable number.

16217725 is a deficient number, since it is larger than the sum of its proper divisors (3892285).

16217725 is an equidigital number, since it uses as much as digits as its factorization.

16217725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648719 (or 648714 counting only the distinct ones).

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

The square root of 16217725 is about 4027.1236633607. The cubic root of 16217725 is about 253.1220489419.

Adding to 16217725 its reverse (52771261), we get a palindrome (68988986).

The spelling of 16217725 in words is "sixteen million, two hundred seventeen thousand, seven hundred twenty-five".