997909958219 has 2 divisors, whose sum is σ = 997909958220. Its totient is φ = 997909958218.

The previous prime is 997909958191. The next prime is 997909958263. The reversal of 997909958219 is 912859909799.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997909958219 is a prime.

It is a super-2 number, since 2×997909958219² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 997909958219.

It is not a weakly prime, because it can be changed into another prime (997909858219) 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, 498954979109 + 498954979110.

It is an arithmetic number, because the mean of its divisors is an integer number (498954979110).

Almost surely, 2^997909958219 is an apocalyptic number.

997909958219 is a deficient number, since it is larger than the sum of its proper divisors (1).

997909958219 is an equidigital number, since it uses as much as digits as its factorization.

997909958219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 297606960, while the sum is 77.

The spelling of 997909958219 in words is "nine hundred ninety-seven billion, nine hundred nine million, nine hundred fifty-eight thousand, two hundred nineteen".