643286841 has 4 divisors (see below), whose sum is σ = 857715792. Its totient is φ = 428857892.

The previous prime is 643286821. The next prime is 643286849. The reversal of 643286841 is 148682346.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 643286841 - 2⁷ = 643286713 is a prime.

It is a super-3 number, since 3×643286841³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 643286793 and 643286802.

It is not an unprimeable number, because it can be changed into a prime (643286849) 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, 107214471 + ... + 107214476.

It is an arithmetic number, because the mean of its divisors is an integer number (214428948).

Almost surely, 2^643286841 is an apocalyptic number.

It is an amenable number.

643286841 is a deficient number, since it is larger than the sum of its proper divisors (214428951).

643286841 is a wasteful number, since it uses less digits than its factorization.

643286841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214428950.

The product of its digits is 221184, while the sum is 42.

The square root of 643286841 is about 25363.0999879747. The cubic root of 643286841 is about 863.2466252452.

The spelling of 643286841 in words is "six hundred forty-three million, two hundred eighty-six thousand, eight hundred forty-one".