641603423 has 4 divisors (see below), whose sum is σ = 669499248. Its totient is φ = 613707600.

The previous prime is 641603401. The next prime is 641603437. The reversal of 641603423 is 324306146.

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 641603423 - 2⁶ = 641603359 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 (641603623) 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, 13947878 + ... + 13947923.

It is an arithmetic number, because the mean of its divisors is an integer number (167374812).

Almost surely, 2^641603423 is an apocalyptic number.

641603423 is a deficient number, since it is larger than the sum of its proper divisors (27895825).

641603423 is a wasteful number, since it uses less digits than its factorization.

641603423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27895824.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 641603423 is about 25329.8918868597. The cubic root of 641603423 is about 862.4929571084.

Adding to 641603423 its reverse (324306146), we get a palindrome (965909569).

The spelling of 641603423 in words is "six hundred forty-one million, six hundred three thousand, four hundred twenty-three".