643232143 has 4 divisors (see below), whose sum is σ = 643682448. Its totient is φ = 642781840.

The previous prime is 643232119. The next prime is 643232167. The reversal of 643232143 is 341232346.

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

It is an interprime number because it is at equal distance from previous prime (643232119) and next prime (643232167).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643232143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643232243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223003 + ... + 225868.

It is an arithmetic number, because the mean of its divisors is an integer number (160920612).

Almost surely, 2^643232143 is an apocalyptic number.

643232143 is a deficient number, since it is larger than the sum of its proper divisors (450305).

643232143 is a wasteful number, since it uses less digits than its factorization.

643232143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450304.

The product of its digits is 10368, while the sum is 28.

The square root of 643232143 is about 25362.0216662631. The cubic root of 643232143 is about 863.2221575690. Note that the first 3 decimals are identical.

Adding to 643232143 its reverse (341232346), we get a palindrome (984464489).

It can be divided in two parts, 64323 and 2143, that added together give a palindrome (66466).

The spelling of 643232143 in words is "six hundred forty-three million, two hundred thirty-two thousand, one hundred forty-three".