641103823 has 2 divisors, whose sum is σ = 641103824. Its totient is φ = 641103822.

The previous prime is 641103811. The next prime is 641103851. The reversal of 641103823 is 328301146.

It is an a-pointer prime, because the next prime (641103851) can be obtained adding 641103823 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 641103823 - 2¹⁷ = 640972751 is a prime.

It is a super-2 number, since 2×641103823² = 822028223730430658, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 641103791 and 641103800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641143823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320551911 + 320551912.

It is an arithmetic number, because the mean of its divisors is an integer number (320551912).

Almost surely, 2^641103823 is an apocalyptic number.

641103823 is a deficient number, since it is larger than the sum of its proper divisors (1).

641103823 is an equidigital number, since it uses as much as digits as its factorization.

641103823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 641103823 is about 25320.0281003004. The cubic root of 641103823 is about 862.2690319867.

Adding to 641103823 its reverse (328301146), we get a palindrome (969404969).

The spelling of 641103823 in words is "six hundred forty-one million, one hundred three thousand, eight hundred twenty-three".