641813903 has 4 divisors (see below), whose sum is σ = 679567680. Its totient is φ = 604060128.

The previous prime is 641813867. The next prime is 641813917. The reversal of 641813903 is 309318146.

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 641813903 - 2⁶ = 641813839 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 (641813923) 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, 18876863 + ... + 18876896.

It is an arithmetic number, because the mean of its divisors is an integer number (169891920).

Almost surely, 2^641813903 is an apocalyptic number.

641813903 is a deficient number, since it is larger than the sum of its proper divisors (37753777).

641813903 is a wasteful number, since it uses less digits than its factorization.

641813903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37753776.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 641813903 is about 25334.0463211071. The cubic root of 641813903 is about 862.5872612966.

The spelling of 641813903 in words is "six hundred forty-one million, eight hundred thirteen thousand, nine hundred three".