641573 has 4 divisors (see below), whose sum is σ = 675360. Its totient is φ = 607788.

The previous prime is 641551. The next prime is 641579. The reversal of 641573 is 375146.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 375146 = 2 ⋅187573.

It is a cyclic number.

It is not a de Polignac number, because 641573 - 2⁸ = 641317 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 (641579) 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, 16865 + ... + 16902.

It is an arithmetic number, because the mean of its divisors is an integer number (168840).

2⁶⁴¹⁵⁷³ is an apocalyptic number.

It is an amenable number.

641573 is a deficient number, since it is larger than the sum of its proper divisors (33787).

641573 is a wasteful number, since it uses less digits than its factorization.

641573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33786.

The product of its digits is 2520, while the sum is 26.

The square root of 641573 is about 800.9825216570. The cubic root of 641573 is about 86.2479324576.

The spelling of 641573 in words is "six hundred forty-one thousand, five hundred seventy-three".