16590809 has 2 divisors, whose sum is σ = 16590810. Its totient is φ = 16590808.

The previous prime is 16590799. The next prime is 16590811. The reversal of 16590809 is 90809561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16224784 + 366025 = 4028^2 + 605^2 .

It is an emirp because it is prime and its reverse (90809561) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16590809 is a prime.

Together with 16590811, 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 (16590839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8295404 + 8295405.

It is an arithmetic number, because the mean of its divisors is an integer number (8295405).

Almost surely, 2^16590809 is an apocalyptic number.

It is an amenable number.

16590809 is a deficient number, since it is larger than the sum of its proper divisors (1).

16590809 is an equidigital number, since it uses as much as digits as its factorization.

16590809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 16590809 is about 4073.1816802102. The cubic root of 16590809 is about 255.0483517181.

The spelling of 16590809 in words is "sixteen million, five hundred ninety thousand, eight hundred nine".