2809420909 has 2 divisors, whose sum is σ = 2809420910. Its totient is φ = 2809420908.

The previous prime is 2809420897. The next prime is 2809420927. The reversal of 2809420909 is 9090249082.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2092788009 + 716632900 = 45747^2 + 26770^2 .

It is a cyclic number.

It is not a de Polignac number, because 2809420909 - 2³¹ = 661937261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2809420109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1404710454 + 1404710455.

It is an arithmetic number, because the mean of its divisors is an integer number (1404710455).

Almost surely, 2^2809420909 is an apocalyptic number.

It is an amenable number.

2809420909 is a deficient number, since it is larger than the sum of its proper divisors (1).

2809420909 is an equidigital number, since it uses as much as digits as its factorization.

2809420909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 2809420909 is about 53003.9706908832. The cubic root of 2809420909 is about 1411.0387377915.

The spelling of 2809420909 in words is "two billion, eight hundred nine million, four hundred twenty thousand, nine hundred nine".