16775321 has 2 divisors, whose sum is σ = 16775322. Its totient is φ = 16775320.

The previous prime is 16775299. The next prime is 16775333. The reversal of 16775321 is 12357761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11485321 + 5290000 = 3389^2 + 2300^2 .

It is a cyclic number.

It is not a de Polignac number, because 16775321 - 2¹⁰ = 16774297 is a prime.

It is a super-2 number, since 2×16775321² = 562822789306082, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16775351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8387660 + 8387661.

It is an arithmetic number, because the mean of its divisors is an integer number (8387661).

Almost surely, 2^16775321 is an apocalyptic number.

It is an amenable number.

16775321 is a deficient number, since it is larger than the sum of its proper divisors (1).

16775321 is an equidigital number, since it uses as much as digits as its factorization.

16775321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8820, while the sum is 32.

The square root of 16775321 is about 4095.7686702254. The cubic root of 16775321 is about 255.9903611687.

The spelling of 16775321 in words is "sixteen million, seven hundred seventy-five thousand, three hundred twenty-one".