643383319 has 2 divisors, whose sum is σ = 643383320. Its totient is φ = 643383318.

The previous prime is 643383317. The next prime is 643383359. The reversal of 643383319 is 913383346.

It is an a-pointer prime, because the next prime (643383359) can be obtained adding 643383319 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643383319 - 2¹ = 643383317 is a prime.

It is a super-2 number, since 2×643383319² = 827884190334911522, which contains 22 as substring.

Together with 643383317, it forms a pair of twin primes.

It is equal to p_33467296 and since 643383319 and 33467296 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643383311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321691659 + 321691660.

It is an arithmetic number, because the mean of its divisors is an integer number (321691660).

Almost surely, 2^643383319 is an apocalyptic number.

643383319 is a deficient number, since it is larger than the sum of its proper divisors (1).

643383319 is an equidigital number, since it uses as much as digits as its factorization.

643383319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 40.

The square root of 643383319 is about 25365.0018529469. The cubic root of 643383319 is about 863.2897786978.

The spelling of 643383319 in words is "six hundred forty-three million, three hundred eighty-three thousand, three hundred nineteen".