641263243 has 16 divisors (see below), whose sum is σ = 694725120. Its totient is φ = 589843296.

The previous prime is 641263219. The next prime is 641263279. The reversal of 641263243 is 342362146.

641263243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 641263243 - 2⁵ = 641263211 is a prime.

It is a super-2 number, since 2×641263243² = 822437093645754098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641263043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 580830 + ... + 581932.

It is an arithmetic number, because the mean of its divisors is an integer number (43420320).

Almost surely, 2^641263243 is an apocalyptic number.

641263243 is a deficient number, since it is larger than the sum of its proper divisors (53461877).

641263243 is a wasteful number, since it uses less digits than its factorization.

641263243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1986.

The product of its digits is 20736, while the sum is 31.

The square root of 641263243 is about 25323.1760053908. The cubic root of 641263243 is about 862.3404980694.

The spelling of 641263243 in words is "six hundred forty-one million, two hundred sixty-three thousand, two hundred forty-three".