16807649 has 2 divisors, whose sum is σ = 16807650. Its totient is φ = 16807648.

The previous prime is 16807633. The next prime is 16807699. The reversal of 16807649 is 94670861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13542400 + 3265249 = 3680^2 + 1807^2 .

It is an emirp because it is prime and its reverse (94670861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16807649 - 2⁴ = 16807633 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16807699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8403824 + 8403825.

It is an arithmetic number, because the mean of its divisors is an integer number (8403825).

Almost surely, 2^16807649 is an apocalyptic number.

It is an amenable number.

16807649 is a deficient number, since it is larger than the sum of its proper divisors (1).

16807649 is an equidigital number, since it uses as much as digits as its factorization.

16807649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 16807649 is about 4099.7132826577. The cubic root of 16807649 is about 256.1546967429.

The spelling of 16807649 in words is "sixteen million, eight hundred seven thousand, six hundred forty-nine".