643037099 has 2 divisors, whose sum is σ = 643037100. Its totient is φ = 643037098.

The previous prime is 643037081. The next prime is 643037113. The reversal of 643037099 is 990730346.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643037099 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (643037029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321518549 + 321518550.

It is an arithmetic number, because the mean of its divisors is an integer number (321518550).

Almost surely, 2^643037099 is an apocalyptic number.

643037099 is a deficient number, since it is larger than the sum of its proper divisors (1).

643037099 is an equidigital number, since it uses as much as digits as its factorization.

643037099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 41.

The square root of 643037099 is about 25358.1761765313. The cubic root of 643037099 is about 863.1348985989.

The spelling of 643037099 in words is "six hundred forty-three million, thirty-seven thousand, ninety-nine".