643231283 has 2 divisors, whose sum is σ = 643231284. Its totient is φ = 643231282.

The previous prime is 643231243. The next prime is 643231297. The reversal of 643231283 is 382132346.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 643231283 - 2⁸ = 643231027 is a prime.

It is not a weakly prime, because it can be changed into another prime (643231243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321615641 + 321615642.

It is an arithmetic number, because the mean of its divisors is an integer number (321615642).

Almost surely, 2^643231283 is an apocalyptic number.

643231283 is a deficient number, since it is larger than the sum of its proper divisors (1).

643231283 is an equidigital number, since it uses as much as digits as its factorization.

643231283 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 32.

The square root of 643231283 is about 25362.0047117731. The cubic root of 643231283 is about 863.2217728601.

The spelling of 643231283 in words is "six hundred forty-three million, two hundred thirty-one thousand, two hundred eighty-three".