641544403 has 2 divisors, whose sum is σ = 641544404.
Its totient is φ = 641544402.
The previous prime is 641544389. The next prime is 641544479. The reversal of 641544403 is 304445146.
641544403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 641544403 - 29 = 641543891 is a prime.
It is not a weakly prime, because it can be changed into another prime (641544493) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320772201 + 320772202.
It is an arithmetic number, because the mean of its divisors is an integer number (320772202).
Almost surely, 2641544403 is an apocalyptic number.
641544403 is a deficient number, since it is larger than the sum of its proper divisors (1).
641544403 is an equidigital number, since it uses as much as digits as its factorization.
641544403 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 23040, while the sum is 31.
The square root of 641544403 is about 25328.7268333803.
The cubic root of 641544403 is about 862.4665098807.
Adding to 641544403 its reverse (304445146), we get a palindrome (945989549).
The spelling of 641544403 in words is "six hundred forty-one million, five hundred forty-four thousand, four hundred three".