643147433 has 2 divisors, whose sum is σ = 643147434. Its totient is φ = 643147432.

The previous prime is 643147429. The next prime is 643147441. The reversal of 643147433 is 334741346.

643147433 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 467770384 + 175377049 = 21628^2 + 13243^2 .

It is a cyclic number.

It is not a de Polignac number, because 643147433 - 2² = 643147429 is a prime.

It is equal to p_33455717 and since 643147433 and 33455717 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 643147393 and 643147402.

It is not a weakly prime, because it can be changed into another prime (643147403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321573716 + 321573717.

It is an arithmetic number, because the mean of its divisors is an integer number (321573717).

Almost surely, 2^643147433 is an apocalyptic number.

It is an amenable number.

643147433 is a deficient number, since it is larger than the sum of its proper divisors (1).

643147433 is an equidigital number, since it uses as much as digits as its factorization.

643147433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 35.

The square root of 643147433 is about 25360.3515945659. The cubic root of 643147433 is about 863.1842620959.

Adding to 643147433 its reverse (334741346), we get a palindrome (977888779).

The spelling of 643147433 in words is "six hundred forty-three million, one hundred forty-seven thousand, four hundred thirty-three".