643383229 has 2 divisors, whose sum is σ = 643383230. Its totient is φ = 643383228.

The previous prime is 643383211. The next prime is 643383233. The reversal of 643383229 is 922383346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 643383225 + 4 = 25365^2 + 2^2 .

It is a cyclic number.

It is not a de Polignac number, because 643383229 - 2⁵ = 643383197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 643383191 and 643383200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643383239) 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, 321691614 + 321691615.

It is an arithmetic number, because the mean of its divisors is an integer number (321691615).

Almost surely, 2^643383229 is an apocalyptic number.

It is an amenable number.

643383229 is a deficient number, since it is larger than the sum of its proper divisors (1).

643383229 is an equidigital number, since it uses as much as digits as its factorization.

643383229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 40.

The square root of 643383229 is about 25365.0000788488. Note that the first 4 decimals coincide. The cubic root of 643383229 is about 863.2897384439.

The spelling of 643383229 in words is "six hundred forty-three million, three hundred eighty-three thousand, two hundred twenty-nine".