641481789 has 16 divisors (see below), whose sum is σ = 921614400. Its totient is φ = 394538496.

The previous prime is 641481787. The next prime is 641481809. The reversal of 641481789 is 987184146.

It is not a de Polignac number, because 641481789 - 2¹ = 641481787 is a prime.

It is a super-2 number, since 2×641481789² = 822997771237281042, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641481787) 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, 92557 + ... + 99245.

It is an arithmetic number, because the mean of its divisors is an integer number (57600900).

Almost surely, 2^641481789 is an apocalyptic number.

It is an amenable number.

641481789 is a deficient number, since it is larger than the sum of its proper divisors (280132611).

641481789 is a wasteful number, since it uses less digits than its factorization.

641481789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9164.

The product of its digits is 387072, while the sum is 48.

The square root of 641481789 is about 25327.4907758349. The cubic root of 641481789 is about 862.4384503862.

The spelling of 641481789 in words is "six hundred forty-one million, four hundred eighty-one thousand, seven hundred eighty-nine".