16994009 has 2 divisors, whose sum is σ = 16994010. Its totient is φ = 16994008.

The previous prime is 16993969. The next prime is 16994011. The reversal of 16994009 is 90049961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16000000 + 994009 = 4000^2 + 997^2 .

It is an emirp because it is prime and its reverse (90049961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16994009 - 2¹⁶ = 16928473 is a prime.

Together with 16994011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16994039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8497004 + 8497005.

It is an arithmetic number, because the mean of its divisors is an integer number (8497005).

Almost surely, 2^16994009 is an apocalyptic number.

It is an amenable number.

16994009 is a deficient number, since it is larger than the sum of its proper divisors (1).

16994009 is an equidigital number, since it uses as much as digits as its factorization.

16994009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 16994009 is about 4122.3790461334. The cubic root of 16994009 is about 257.0979505208.

It can be divided in two parts, 16 and 994009, that multiplied together give a square (15904144 = 3988²).

The spelling of 16994009 in words is "sixteen million, nine hundred ninety-four thousand, nine".