2103309809 has 2 divisors, whose sum is σ = 2103309810. Its totient is φ = 2103309808.

The previous prime is 2103309781. The next prime is 2103309841. The reversal of 2103309809 is 9089033012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1436637409 + 666672400 = 37903^2 + 25820^2 .

It is a cyclic number.

It is not a de Polignac number, because 2103309809 - 2¹² = 2103305713 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2103309409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051654904 + 1051654905.

It is an arithmetic number, because the mean of its divisors is an integer number (1051654905).

Almost surely, 2^2103309809 is an apocalyptic number.

It is an amenable number.

2103309809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2103309809 is an equidigital number, since it uses as much as digits as its factorization.

2103309809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 2103309809 is about 45861.8557082027. The cubic root of 2103309809 is about 1281.2515852481.

The spelling of 2103309809 in words is "two billion, one hundred three million, three hundred nine thousand, eight hundred nine".