641023 has 4 divisors (see below), whose sum is σ = 645840. Its totient is φ = 636208.

The previous prime is 640993. The next prime is 641051. The reversal of 641023 is 320146.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 320146 = 2 ⋅160073.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640988 and 641006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641083) 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, 2203 + ... + 2476.

It is an arithmetic number, because the mean of its divisors is an integer number (161460).

2⁶⁴¹⁰²³ is an apocalyptic number.

641023 is a deficient number, since it is larger than the sum of its proper divisors (4817).

641023 is a wasteful number, since it uses less digits than its factorization.

641023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4816.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 641023 is about 800.6391197038. The cubic root of 641023 is about 86.2232795475.

Adding to 641023 its reverse (320146), we get a palindrome (961169).

The spelling of 641023 in words is "six hundred forty-one thousand, twenty-three".