641859843 has 8 divisors (see below), whose sum is σ = 900856000. Its totient is φ = 405385128.

The previous prime is 641859821. The next prime is 641859853. The reversal of 641859843 is 348958146.

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

It is not a de Polignac number, because 641859843 - 2⁸ = 641859587 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 641859792 and 641859801.

It is not an unprimeable number, because it can be changed into a prime (641859853) 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, 5630293 + ... + 5630406.

It is an arithmetic number, because the mean of its divisors is an integer number (112607000).

Almost surely, 2^641859843 is an apocalyptic number.

641859843 is a deficient number, since it is larger than the sum of its proper divisors (258996157).

641859843 is a wasteful number, since it uses less digits than its factorization.

641859843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11260721.

The product of its digits is 829440, while the sum is 48.

The square root of 641859843 is about 25334.9529898913. The cubic root of 641859843 is about 862.6078416721.

The spelling of 641859843 in words is "six hundred forty-one million, eight hundred fifty-nine thousand, eight hundred forty-three".