643309597 has 16 divisors (see below), whose sum is σ = 781038720. Its totient is φ = 517252608.

The previous prime is 643309577. The next prime is 643309637. The reversal of 643309597 is 795903346.

It is not a de Polignac number, because 643309597 - 2¹¹ = 643307549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643309547) 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 in 15 ways as a sum of consecutive naturals, for example, 27729 + ... + 45337.

It is an arithmetic number, because the mean of its divisors is an integer number (48814920).

Almost surely, 2^643309597 is an apocalyptic number.

It is an amenable number.

643309597 is a deficient number, since it is larger than the sum of its proper divisors (137729123).

643309597 is a wasteful number, since it uses less digits than its factorization.

643309597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17940.

The product of its (nonzero) digits is 612360, while the sum is 46.

The square root of 643309597 is about 25363.5485884763. The cubic root of 643309597 is about 863.2568041199.

The spelling of 643309597 in words is "six hundred forty-three million, three hundred nine thousand, five hundred ninety-seven".