641000263 has 4 divisors (see below), whose sum is σ = 642111760. Its totient is φ = 639888768.

The previous prime is 641000251. The next prime is 641000303. The reversal of 641000263 is 362000146.

641000263 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 362000146 = 2 ⋅181000073.

It is a cyclic number.

It is not a de Polignac number, because 641000263 - 2⁵ = 641000231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641000203) 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, 554883 + ... + 556036.

It is an arithmetic number, because the mean of its divisors is an integer number (160527940).

Almost surely, 2^641000263 is an apocalyptic number.

641000263 is a deficient number, since it is larger than the sum of its proper divisors (1111497).

641000263 is a wasteful number, since it uses less digits than its factorization.

641000263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111496.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 641000263 is about 25317.9829962815. The cubic root of 641000263 is about 862.2226009270. Note that the first 3 decimals are identical.

The spelling of 641000263 in words is "six hundred forty-one million, two hundred sixty-three", and thus it is an aban number.