17914920209 has 2 divisors, whose sum is σ = 17914920210. Its totient is φ = 17914920208.

The previous prime is 17914920173. The next prime is 17914920211. The reversal of 17914920209 is 90202941971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17517316609 + 397603600 = 132353^2 + 19940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17914920209 is a prime.

It is a Sophie Germain prime.

Together with 17914920211, it forms a pair of twin primes.

It is a Chen 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 17914920209.

It is not a weakly prime, because it can be changed into another prime (17914920509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8957460104 + 8957460105.

It is an arithmetic number, because the mean of its divisors is an integer number (8957460105).

Almost surely, 2^17914920209 is an apocalyptic number.

It is an amenable number.

17914920209 is a deficient number, since it is larger than the sum of its proper divisors (1).

17914920209 is an equidigital number, since it uses as much as digits as its factorization.

17914920209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 44.

The spelling of 17914920209 in words is "seventeen billion, nine hundred fourteen million, nine hundred twenty thousand, two hundred nine".