643211383 has 2 divisors, whose sum is σ = 643211384. Its totient is φ = 643211382.

The previous prime is 643211381. The next prime is 643211411. The reversal of 643211383 is 383112346.

643211383 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643211383 - 2¹ = 643211381 is a prime.

Together with 643211381, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643211381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321605691 + 321605692.

It is an arithmetic number, because the mean of its divisors is an integer number (321605692).

Almost surely, 2^643211383 is an apocalyptic number.

643211383 is a deficient number, since it is larger than the sum of its proper divisors (1).

643211383 is an equidigital number, since it uses as much as digits as its factorization.

643211383 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 31.

The square root of 643211383 is about 25361.6123895938. The cubic root of 643211383 is about 863.2128707794.

The spelling of 643211383 in words is "six hundred forty-three million, two hundred eleven thousand, three hundred eighty-three".