643203231 has 8 divisors (see below), whose sum is σ = 935568384. Its totient is φ = 389820120.

The previous prime is 643203199. The next prime is 643203247. The reversal of 643203231 is 132302346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 643203231 - 2⁵ = 643203199 is a prime.

It is a super-2 number, since 2×643203231² = 827420792737678722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643203931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9745471 + ... + 9745536.

It is an arithmetic number, because the mean of its divisors is an integer number (116946048).

Almost surely, 2^643203231 is an apocalyptic number.

643203231 is a deficient number, since it is larger than the sum of its proper divisors (292365153).

643203231 is a wasteful number, since it uses less digits than its factorization.

643203231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19491021.

The product of its (nonzero) digits is 2592, while the sum is 24.

The square root of 643203231 is about 25361.4516737509. The cubic root of 643203231 is about 863.2092240047.

Adding to 643203231 its reverse (132302346), we get a palindrome (775505577).

The spelling of 643203231 in words is "six hundred forty-three million, two hundred three thousand, two hundred thirty-one".