643006597 has 2 divisors, whose sum is σ = 643006598. Its totient is φ = 643006596.

The previous prime is 643006591. The next prime is 643006627. The reversal of 643006597 is 795600346.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 512841316 + 130165281 = 22646^2 + 11409^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643006597 is a prime.

It is a Chen prime.

It is equal to p_33448765 and since 643006597 and 33448765 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643006591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321503298 + 321503299.

It is an arithmetic number, because the mean of its divisors is an integer number (321503299).

Almost surely, 2^643006597 is an apocalyptic number.

It is an amenable number.

643006597 is a deficient number, since it is larger than the sum of its proper divisors (1).

643006597 is an equidigital number, since it uses as much as digits as its factorization.

643006597 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 40.

The square root of 643006597 is about 25357.5747460202. The cubic root of 643006597 is about 863.1212509898.

The spelling of 643006597 in words is "six hundred forty-three million, six thousand, five hundred ninety-seven".