2809779073 has 2 divisors, whose sum is σ = 2809779074. Its totient is φ = 2809779072.

The previous prime is 2809779043. The next prime is 2809779083. The reversal of 2809779073 is 3709779082.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2731421169 + 78357904 = 52263^2 + 8852^2 .

It is a cyclic number.

It is not a de Polignac number, because 2809779073 - 2¹⁷ = 2809648001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2809779073.

It is not a weakly prime, because it can be changed into another prime (2809779043) 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, 1404889536 + 1404889537.

It is an arithmetic number, because the mean of its divisors is an integer number (1404889537).

Almost surely, 2^2809779073 is an apocalyptic number.

It is an amenable number.

2809779073 is a deficient number, since it is larger than the sum of its proper divisors (1).

2809779073 is an equidigital number, since it uses as much as digits as its factorization.

2809779073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1333584, while the sum is 52.

The square root of 2809779073 is about 53007.3492357428. The cubic root of 2809779073 is about 1411.0986981677.

Subtracting 2809779073 from its reverse (3709779082), we obtain a palindrome (900000009).

The spelling of 2809779073 in words is "two billion, eight hundred nine million, seven hundred seventy-nine thousand, seventy-three".