622394809 has 2 divisors, whose sum is σ = 622394810. Its totient is φ = 622394808.

The previous prime is 622394807. The next prime is 622394813. The reversal of 622394809 is 908493226.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 549668025 + 72726784 = 23445^2 + 8528^2 .

It is a cyclic number.

It is not a de Polignac number, because 622394809 - 2¹ = 622394807 is a prime.

Together with 622394807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (622394807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311197404 + 311197405.

It is an arithmetic number, because the mean of its divisors is an integer number (311197405).

Almost surely, 2^622394809 is an apocalyptic number.

It is an amenable number.

622394809 is a deficient number, since it is larger than the sum of its proper divisors (1).

622394809 is an equidigital number, since it uses as much as digits as its factorization.

622394809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 622394809 is about 24947.8417703817. The cubic root of 622394809 is about 853.7983685396.

The spelling of 622394809 in words is "six hundred twenty-two million, three hundred ninety-four thousand, eight hundred nine".