2168426809 has 2 divisors, whose sum is σ = 2168426810. Its totient is φ = 2168426808.

The previous prime is 2168426791. The next prime is 2168426903. The reversal of 2168426809 is 9086248612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1851408784 + 317018025 = 43028^2 + 17805^2 .

It is a cyclic number.

It is not a de Polignac number, because 2168426809 - 2¹³ = 2168418617 is a prime.

It is not a weakly prime, because it can be changed into another prime (2168421809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1084213404 + 1084213405.

It is an arithmetic number, because the mean of its divisors is an integer number (1084213405).

Almost surely, 2^2168426809 is an apocalyptic number.

It is an amenable number.

2168426809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2168426809 is an equidigital number, since it uses as much as digits as its factorization.

2168426809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 331776, while the sum is 46.

The square root of 2168426809 is about 46566.3699358239. The cubic root of 2168426809 is about 1294.3396521017.

The spelling of 2168426809 in words is "two billion, one hundred sixty-eight million, four hundred twenty-six thousand, eight hundred nine".