17209420849 has 2 divisors, whose sum is σ = 17209420850. Its totient is φ = 17209420848.

The previous prime is 17209420769. The next prime is 17209420853. The reversal of 17209420849 is 94802490271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16630681600 + 578739249 = 128960^2 + 24057^2 .

It is a cyclic number.

It is not a de Polignac number, because 17209420849 - 2⁹ = 17209420337 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 17209420799 and 17209420808.

It is not a weakly prime, because it can be changed into another prime (17209420889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8604710424 + 8604710425.

It is an arithmetic number, because the mean of its divisors is an integer number (8604710425).

Almost surely, 2^17209420849 is an apocalyptic number.

It is an amenable number.

17209420849 is a deficient number, since it is larger than the sum of its proper divisors (1).

17209420849 is an equidigital number, since it uses as much as digits as its factorization.

17209420849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 17209420849 in words is "seventeen billion, two hundred nine million, four hundred twenty thousand, eight hundred forty-nine".