16793281 has 2 divisors, whose sum is σ = 16793282. Its totient is φ = 16793280.

The previous prime is 16793251. The next prime is 16793299. The reversal of 16793281 is 18239761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12362256 + 4431025 = 3516^2 + 2105^2 .

It is an emirp because it is prime and its reverse (18239761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16793281 - 2¹¹ = 16791233 is a prime.

It is a super-2 number, since 2×16793281² = 564028573489922, which contains 22 as substring.

It is equal to p_1078858 and since 16793281 and 1078858 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16793281.

It is not a weakly prime, because it can be changed into another prime (16793251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8396640 + 8396641.

It is an arithmetic number, because the mean of its divisors is an integer number (8396641).

Almost surely, 2^16793281 is an apocalyptic number.

It is an amenable number.

16793281 is a deficient number, since it is larger than the sum of its proper divisors (1).

16793281 is an equidigital number, since it uses as much as digits as its factorization.

16793281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 16793281 is about 4097.9605903425. The cubic root of 16793281 is about 256.0816847486.

The spelling of 16793281 in words is "sixteen million, seven hundred ninety-three thousand, two hundred eighty-one".