2116517209 has 2 divisors, whose sum is σ = 2116517210. Its totient is φ = 2116517208.

The previous prime is 2116517191. The next prime is 2116517213. The reversal of 2116517209 is 9027156112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1538835984 + 577681225 = 39228^2 + 24035^2 .

It is a cyclic number.

It is not a de Polignac number, because 2116517209 - 2⁵ = 2116517177 is a prime.

It is not a weakly prime, because it can be changed into another prime (2116517239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1058258604 + 1058258605.

It is an arithmetic number, because the mean of its divisors is an integer number (1058258605).

Almost surely, 2^2116517209 is an apocalyptic number.

It is an amenable number.

2116517209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2116517209 is an equidigital number, since it uses as much as digits as its factorization.

2116517209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 2116517209 is about 46005.6214934653. The cubic root of 2116517209 is about 1283.9277967263.

The spelling of 2116517209 in words is "two billion, one hundred sixteen million, five hundred seventeen thousand, two hundred nine".