16990817 has 2 divisors, whose sum is σ = 16990818. Its totient is φ = 16990816.

The previous prime is 16990801. The next prime is 16990843. The reversal of 16990817 is 71809961.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16516096 + 474721 = 4064^2 + 689^2 .

It is an emirp because it is prime and its reverse (71809961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16990817 - 2⁴ = 16990801 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16990217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8495408 + 8495409.

It is an arithmetic number, because the mean of its divisors is an integer number (8495409).

Almost surely, 2^16990817 is an apocalyptic number.

It is an amenable number.

16990817 is a deficient number, since it is larger than the sum of its proper divisors (1).

16990817 is an equidigital number, since it uses as much as digits as its factorization.

16990817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 16990817 is about 4121.9918728692. The cubic root of 16990817 is about 257.0818525331.

The spelling of 16990817 in words is "sixteen million, nine hundred ninety thousand, eight hundred seventeen".