643144043 has 2 divisors, whose sum is σ = 643144044. Its totient is φ = 643144042.

The previous prime is 643144037. The next prime is 643144079. The reversal of 643144043 is 340441346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643144043 - 2⁶ = 643143979 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 643143997 and 643144015.

It is not a weakly prime, because it can be changed into another prime (643144013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321572021 + 321572022.

It is an arithmetic number, because the mean of its divisors is an integer number (321572022).

Almost surely, 2^643144043 is an apocalyptic number.

643144043 is a deficient number, since it is larger than the sum of its proper divisors (1).

643144043 is an equidigital number, since it uses as much as digits as its factorization.

643144043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 29.

The square root of 643144043 is about 25360.2847578650. The cubic root of 643144043 is about 863.1827454919.

Adding to 643144043 its reverse (340441346), we get a palindrome (983585389).

The spelling of 643144043 in words is "six hundred forty-three million, one hundred forty-four thousand, forty-three".