643303231 has 4 divisors (see below), whose sum is σ = 643416264. Its totient is φ = 643190200.

The previous prime is 643303223. The next prime is 643303249. The reversal of 643303231 is 132303346.

643303231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 643303231 - 2³ = 643303223 is a prime.

It is a super-2 number, since 2×643303231² = 827678094030078722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 643303196 and 643303205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643309231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47500 + ... + 59521.

It is an arithmetic number, because the mean of its divisors is an integer number (160854066).

Almost surely, 2^643303231 is an apocalyptic number.

643303231 is a deficient number, since it is larger than the sum of its proper divisors (113033).

643303231 is a wasteful number, since it uses less digits than its factorization.

643303231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113032.

The product of its (nonzero) digits is 3888, while the sum is 25.

The square root of 643303231 is about 25363.4230931079. The cubic root of 643303231 is about 863.2539565999.

Adding to 643303231 its reverse (132303346), we get a palindrome (775606577).

The spelling of 643303231 in words is "six hundred forty-three million, three hundred three thousand, two hundred thirty-one".