643099 has 2 divisors, whose sum is σ = 643100. Its totient is φ = 643098.

The previous prime is 643087. The next prime is 643121. The reversal of 643099 is 990346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643099 - 2¹¹ = 641051 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 643099.

It is not a weakly prime, because it can be changed into another prime (643009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321549 + 321550.

It is an arithmetic number, because the mean of its divisors is an integer number (321550).

2⁶⁴³⁰⁹⁹ is an apocalyptic number.

643099 is a deficient number, since it is larger than the sum of its proper divisors (1).

643099 is an equidigital number, since it uses as much as digits as its factorization.

643099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 643099 is about 801.9345359816. The cubic root of 643099 is about 86.3162593838.

The spelling of 643099 in words is "six hundred forty-three thousand, ninety-nine".