16681337 has 2 divisors, whose sum is σ = 16681338. Its totient is φ = 16681336.

The previous prime is 16681333. The next prime is 16681361. The reversal of 16681337 is 73318661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9369721 + 7311616 = 3061^2 + 2704^2 .

It is a cyclic number.

It is not a de Polignac number, because 16681337 - 2² = 16681333 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 16681297 and 16681306.

It is not a weakly prime, because it can be changed into another prime (16681333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8340668 + 8340669.

It is an arithmetic number, because the mean of its divisors is an integer number (8340669).

Almost surely, 2^16681337 is an apocalyptic number.

It is an amenable number.

16681337 is a deficient number, since it is larger than the sum of its proper divisors (1).

16681337 is an equidigital number, since it uses as much as digits as its factorization.

16681337 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 35.

The square root of 16681337 is about 4084.2792509817. The cubic root of 16681337 is about 255.5114022508.

Adding to 16681337 its reverse (73318661), we get a palindrome (89999998).

The spelling of 16681337 in words is "sixteen million, six hundred eighty-one thousand, three hundred thirty-seven".