643583 has 2 divisors, whose sum is σ = 643584. Its totient is φ = 643582.

The previous prime is 643567. The next prime is 643589. The reversal of 643583 is 385346.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 643583 - 2⁴ = 643567 is a prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 6³ + 4⁵ + 5⁷ + 3² + 8⁵ + 3¹² .

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 643583.

It is not a weakly prime, because it can be changed into another prime (643589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321791 + 321792.

It is an arithmetic number, because the mean of its divisors is an integer number (321792).

2⁶⁴³⁵⁸³ is an apocalyptic number.

643583 is a deficient number, since it is larger than the sum of its proper divisors (1).

643583 is an equidigital number, since it uses as much as digits as its factorization.

643583 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 29.

The square root of 643583 is about 802.2362494926. The cubic root of 643583 is about 86.3379079913.

The spelling of 643583 in words is "six hundred forty-three thousand, five hundred eighty-three".