643041227 has 4 divisors (see below), whose sum is σ = 649670616. Its totient is φ = 636411840.

The previous prime is 643041181. The next prime is 643041229. The reversal of 643041227 is 722140346.

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 643041227 - 2⁸ = 643040971 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 643041227.

It is not an unprimeable number, because it can be changed into a prime (643041229) 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, 3314549 + ... + 3314742.

It is an arithmetic number, because the mean of its divisors is an integer number (162417654).

Almost surely, 2^643041227 is an apocalyptic number.

643041227 is a deficient number, since it is larger than the sum of its proper divisors (6629389).

643041227 is an equidigital number, since it uses as much as digits as its factorization.

643041227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6629388.

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 643041227 is about 25358.2575702669. The cubic root of 643041227 is about 863.1367455702.

The spelling of 643041227 in words is "six hundred forty-three million, forty-one thousand, two hundred twenty-seven".