16706981 has 2 divisors, whose sum is σ = 16706982. Its totient is φ = 16706980.

The previous prime is 16706957. The next prime is 16707029. The reversal of 16706981 is 18960761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16120225 + 586756 = 4015^2 + 766^2 .

It is a cyclic number.

It is not a de Polignac number, because 16706981 - 2⁶ = 16706917 is a prime.

It is a super-2 number, since 2×16706981² = 558246428268722, which contains 22 as substring.

It is a Chen prime.

It is a nialpdrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16706881) 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, 8353490 + 8353491.

It is an arithmetic number, because the mean of its divisors is an integer number (8353491).

Almost surely, 2^16706981 is an apocalyptic number.

It is an amenable number.

16706981 is a deficient number, since it is larger than the sum of its proper divisors (1).

16706981 is an equidigital number, since it uses as much as digits as its factorization.

16706981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 16706981 is about 4087.4173997770. The cubic root of 16706981 is about 255.6422666545.

The spelling of 16706981 in words is "sixteen million, seven hundred six thousand, nine hundred eighty-one".