2115770809 has 2 divisors, whose sum is σ = 2115770810. Its totient is φ = 2115770808.

The previous prime is 2115770803. The next prime is 2115770933. The reversal of 2115770809 is 9080775112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1255639225 + 860131584 = 35435^2 + 29328^2 .

It is a cyclic number.

It is not a de Polignac number, because 2115770809 - 2⁷ = 2115770681 is a prime.

It is a super-2 number, since 2×2115770809² = 8952972232433028962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2115770803) 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, 1057885404 + 1057885405.

It is an arithmetic number, because the mean of its divisors is an integer number (1057885405).

Almost surely, 2^2115770809 is an apocalyptic number.

It is an amenable number.

2115770809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2115770809 is an equidigital number, since it uses as much as digits as its factorization.

2115770809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 40.

The square root of 2115770809 is about 45997.5087260169. The cubic root of 2115770809 is about 1283.7768512047.

The spelling of 2115770809 in words is "two billion, one hundred fifteen million, seven hundred seventy thousand, eight hundred nine".