621716219 has 2 divisors, whose sum is σ = 621716220. Its totient is φ = 621716218.

The previous prime is 621716213. The next prime is 621716237. The reversal of 621716219 is 912617126.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621716219 is a prime.

It is a super-2 number, since 2×621716219² = 773062113935311922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (621716213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310858109 + 310858110.

It is an arithmetic number, because the mean of its divisors is an integer number (310858110).

Almost surely, 2^621716219 is an apocalyptic number.

621716219 is a deficient number, since it is larger than the sum of its proper divisors (1).

621716219 is an equidigital number, since it uses as much as digits as its factorization.

621716219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 35.

The square root of 621716219 is about 24934.2378868896. The cubic root of 621716219 is about 853.4879601420.

The spelling of 621716219 in words is "six hundred twenty-one million, seven hundred sixteen thousand, two hundred nineteen".