16280809 has 2 divisors, whose sum is σ = 16280810. Its totient is φ = 16280808.

The previous prime is 16280791. The next prime is 16280819. The reversal of 16280809 is 90808261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16160400 + 120409 = 4020^2 + 347^2 .

It is an emirp because it is prime and its reverse (90808261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16280809 - 2¹¹ = 16278761 is a prime.

It is not a weakly prime, because it can be changed into another prime (16280819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8140404 + 8140405.

It is an arithmetic number, because the mean of its divisors is an integer number (8140405).

Almost surely, 2^16280809 is an apocalyptic number.

It is an amenable number.

16280809 is a deficient number, since it is larger than the sum of its proper divisors (1).

16280809 is an equidigital number, since it uses as much as digits as its factorization.

16280809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 16280809 is about 4034.9484507240. The cubic root of 16280809 is about 253.4498238881.

It can be divided in two parts, 16 and 280809, that multiplied together give a palindrome (4492944).

The spelling of 16280809 in words is "sixteen million, two hundred eighty thousand, eight hundred nine".