643528283 has 2 divisors, whose sum is σ = 643528284. Its totient is φ = 643528282.

The previous prime is 643528231. The next prime is 643528297. The reversal of 643528283 is 382825346.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 643528283 - 2¹⁶ = 643462747 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 643528283.

It is not a weakly prime, because it can be changed into another prime (643528213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321764141 + 321764142.

It is an arithmetic number, because the mean of its divisors is an integer number (321764142).

Almost surely, 2^643528283 is an apocalyptic number.

643528283 is a deficient number, since it is larger than the sum of its proper divisors (1).

643528283 is an equidigital number, since it uses as much as digits as its factorization.

643528283 is an evil number, because the sum of its binary digits is even.

The product of its digits is 276480, while the sum is 41.

The square root of 643528283 is about 25367.8592514229. The cubic root of 643528283 is about 863.3546112468.

The spelling of 643528283 in words is "six hundred forty-three million, five hundred twenty-eight thousand, two hundred eighty-three".