643273 has 2 divisors, whose sum is σ = 643274. Its totient is φ = 643272.

The previous prime is 643243. The next prime is 643301. The reversal of 643273 is 372346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 558009 + 85264 = 747^2 + 292^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643273 is a prime.

It is a d-powerful number, because it can be written as 6⁴ + 4 + 2¹⁹ + 3² + 7⁶ + 3³ .

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321636 + 321637.

It is an arithmetic number, because the mean of its divisors is an integer number (321637).

2⁶⁴³²⁷³ is an apocalyptic number.

It is an amenable number.

643273 is a deficient number, since it is larger than the sum of its proper divisors (1).

643273 is an equidigital number, since it uses as much as digits as its factorization.

643273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 25.

The square root of 643273 is about 802.0430163027. The cubic root of 643273 is about 86.3240433978.

The spelling of 643273 in words is "six hundred forty-three thousand, two hundred seventy-three".