641841853 has 2 divisors, whose sum is σ = 641841854. Its totient is φ = 641841852.

The previous prime is 641841773. The next prime is 641841877. The reversal of 641841853 is 358148146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 555686329 + 86155524 = 23573^2 + 9282^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641841853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641841653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320920926 + 320920927.

It is an arithmetic number, because the mean of its divisors is an integer number (320920927).

Almost surely, 2^641841853 is an apocalyptic number.

It is an amenable number.

641841853 is a deficient number, since it is larger than the sum of its proper divisors (1).

641841853 is an equidigital number, since it uses as much as digits as its factorization.

641841853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92160, while the sum is 40.

The square root of 641841853 is about 25334.5979443132. The cubic root of 641841853 is about 862.5997825606.

Adding to 641841853 its reverse (358148146), we get a palindrome (999989999).

The spelling of 641841853 in words is "six hundred forty-one million, eight hundred forty-one thousand, eight hundred fifty-three".