16321617 has 12 divisors (see below), whose sum is σ = 25389364. Its totient is φ = 10044000.

The previous prime is 16321579. The next prime is 16321619. The reversal of 16321617 is 71612361.

16321617 is a `hidden beast` number, since 1 + 632 + 16 + 17 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9144576 + 7177041 = 3024^2 + 2679^2 .

It is not a de Polignac number, because 16321617 - 2⁷ = 16321489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16321619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69634 + ... + 69867.

Almost surely, 2^16321617 is an apocalyptic number.

It is an amenable number.

16321617 is a deficient number, since it is larger than the sum of its proper divisors (9067747).

16321617 is a wasteful number, since it uses less digits than its factorization.

16321617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139520 (or 139517 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 16321617 is about 4040.0021039598. The cubic root of 16321617 is about 253.6614053274.

Adding to 16321617 its reverse (71612361), we get a palindrome (87933978).

It can be divided in two parts, 1632 and 1617, that added together give a square (3249 = 57²).

The spelling of 16321617 in words is "sixteen million, three hundred twenty-one thousand, six hundred seventeen".