643101443 has 4 divisors (see below), whose sum is σ = 652700040. Its totient is φ = 633502848.

The previous prime is 643101397. The next prime is 643101499. The reversal of 643101443 is 344101346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 344101346 = 2 ⋅172050673.

It is a cyclic number.

It is not a de Polignac number, because 643101443 - 2¹² = 643097347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643101343) 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, 4799198 + ... + 4799331.

It is an arithmetic number, because the mean of its divisors is an integer number (163175010).

Almost surely, 2^643101443 is an apocalyptic number.

643101443 is a deficient number, since it is larger than the sum of its proper divisors (9598597).

643101443 is an equidigital number, since it uses as much as digits as its factorization.

643101443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9598596.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 643101443 is about 25359.4448480246. Note that the first 3 decimals coincide. The cubic root of 643101443 is about 863.1636868289.

Adding to 643101443 its reverse (344101346), we get a palindrome (987202789).

The spelling of 643101443 in words is "six hundred forty-three million, one hundred one thousand, four hundred forty-three".