643024903 has 2 divisors, whose sum is σ = 643024904. Its totient is φ = 643024902.

The previous prime is 643024871. The next prime is 643024913. The reversal of 643024903 is 309420346.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 643024903 - 2⁵ = 643024871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643024913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321512451 + 321512452.

It is an arithmetic number, because the mean of its divisors is an integer number (321512452).

Almost surely, 2^643024903 is an apocalyptic number.

643024903 is a deficient number, since it is larger than the sum of its proper divisors (1).

643024903 is an equidigital number, since it uses as much as digits as its factorization.

643024903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 643024903 is about 25357.9357006835. The cubic root of 643024903 is about 863.1294417547.

The spelling of 643024903 in words is "six hundred forty-three million, twenty-four thousand, nine hundred three".