641443023 has 32 divisors (see below), whose sum is σ = 1024900800. Its totient is φ = 394149888.

The previous prime is 641443003. The next prime is 641443057. The reversal of 641443023 is 320344146.

It is not a de Polignac number, because 641443023 - 2¹³ = 641434831 is a prime.

It is a super-2 number, since 2×641443023² = 822898303510757058, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641443003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 454543 + ... + 455951.

It is an arithmetic number, because the mean of its divisors is an integer number (32028150).

Almost surely, 2^641443023 is an apocalyptic number.

641443023 is a deficient number, since it is larger than the sum of its proper divisors (383457777).

641443023 is a wasteful number, since it uses less digits than its factorization.

641443023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2728 (or 2722 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 641443023 is about 25326.7254693535. The cubic root of 641443023 is about 862.4210770884.

Adding to 641443023 its reverse (320344146), we get a palindrome (961787169).

The spelling of 641443023 in words is "six hundred forty-one million, four hundred forty-three thousand, twenty-three".