999764219 has 2 divisors, whose sum is σ = 999764220. Its totient is φ = 999764218.

The previous prime is 999764201. The next prime is 999764231. The reversal of 999764219 is 912467999.

It is a strong prime.

It is an emirp because it is prime and its reverse (912467999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999764219 is a prime.

It is a super-2 number, since 2×999764219² = 1999056987185359922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999764719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499882109 + 499882110.

It is an arithmetic number, because the mean of its divisors is an integer number (499882110).

Almost surely, 2^999764219 is an apocalyptic number.

999764219 is a deficient number, since it is larger than the sum of its proper divisors (1).

999764219 is an equidigital number, since it uses as much as digits as its factorization.

999764219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2204496, while the sum is 56.

The square root of 999764219 is about 31619.0483569636. The cubic root of 999764219 is about 999.9214001556.

The spelling of 999764219 in words is "nine hundred ninety-nine million, seven hundred sixty-four thousand, two hundred nineteen".