2217960809 has 2 divisors, whose sum is σ = 2217960810. Its totient is φ = 2217960808.

The previous prime is 2217960799. The next prime is 2217960827. The reversal of 2217960809 is 9080697122.

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., 1548186409 + 669774400 = 39347^2 + 25880^2 .

It is a cyclic number.

It is not a de Polignac number, because 2217960809 - 2⁸ = 2217960553 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2217960809.

It is not a weakly prime, because it can be changed into another prime (2217960109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1108980404 + 1108980405.

It is an arithmetic number, because the mean of its divisors is an integer number (1108980405).

Almost surely, 2^2217960809 is an apocalyptic number.

It is an amenable number.

2217960809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2217960809 is an equidigital number, since it uses as much as digits as its factorization.

2217960809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 2217960809 is about 47095.2312766378. The cubic root of 2217960809 is about 1304.1212031899.

The spelling of 2217960809 in words is "two billion, two hundred seventeen million, nine hundred sixty thousand, eight hundred nine".