643183 has 2 divisors, whose sum is σ = 643184. Its totient is φ = 643182.

The previous prime is 643129. The next prime is 643187. The reversal of 643183 is 381346.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321591 + 321592.

It is an arithmetic number, because the mean of its divisors is an integer number (321592).

2⁶⁴³¹⁸³ is an apocalyptic number.

643183 is a deficient number, since it is larger than the sum of its proper divisors (1).

643183 is an equidigital number, since it uses as much as digits as its factorization.

643183 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 25.

The square root of 643183 is about 801.9869076238. The cubic root of 643183 is about 86.3200173589.

The spelling of 643183 in words is "six hundred forty-three thousand, one hundred eighty-three".