643199 has 2 divisors, whose sum is σ = 643200. Its totient is φ = 643198.

The previous prime is 643187. The next prime is 643213. The reversal of 643199 is 991346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643199 - 2⁴ = 643183 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321599 + 321600.

It is an arithmetic number, because the mean of its divisors is an integer number (321600).

2⁶⁴³¹⁹⁹ is an apocalyptic number.

643199 is a deficient number, since it is larger than the sum of its proper divisors (1).

643199 is an equidigital number, since it uses as much as digits as its factorization.

643199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 32.

The square root of 643199 is about 801.9968827870. The cubic root of 643199 is about 86.3207331266.

The spelling of 643199 in words is "six hundred forty-three thousand, one hundred ninety-nine".