643231067 has 2 divisors, whose sum is σ = 643231068. Its totient is φ = 643231066.

The previous prime is 643231027. The next prime is 643231117. The reversal of 643231067 is 760132346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643231067 - 2¹² = 643226971 is a prime.

It is not a weakly prime, because it can be changed into another prime (643231027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321615533 + 321615534.

It is an arithmetic number, because the mean of its divisors is an integer number (321615534).

Almost surely, 2^643231067 is an apocalyptic number.

643231067 is a deficient number, since it is larger than the sum of its proper divisors (1).

643231067 is an equidigital number, since it uses as much as digits as its factorization.

643231067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 643231067 is about 25362.0004534343. Note that the first 3 decimals coincide. The cubic root of 643231067 is about 863.2216762355.

The spelling of 643231067 in words is "six hundred forty-three million, two hundred thirty-one thousand, sixty-seven".