641321 has 4 divisors (see below), whose sum is σ = 658692. Its totient is φ = 623952.

The previous prime is 641317. The next prime is 641327. The reversal of 641321 is 123146.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 287296 + 354025 = 536^2 + 595^2 .

It is a cyclic number.

It is not a de Polignac number, because 641321 - 2² = 641317 is a prime.

It is a super-2 number, since 2×641321² = 822585250082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 641321.

It is not an unprimeable number, because it can be changed into a prime (641327) 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, 8630 + ... + 8703.

It is an arithmetic number, because the mean of its divisors is an integer number (164673).

2⁶⁴¹³²¹ is an apocalyptic number.

It is an amenable number.

641321 is a deficient number, since it is larger than the sum of its proper divisors (17371).

641321 is a wasteful number, since it uses less digits than its factorization.

641321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17370.

The product of its digits is 144, while the sum is 17.

The square root of 641321 is about 800.8251994037. The cubic root of 641321 is about 86.2366386920.

Adding to 641321 its reverse (123146), we get a palindrome (764467).

It can be divided in two parts, 641 and 321, that multiplied together give a triangular number (205761 = T₆₄₁).

The spelling of 641321 in words is "six hundred forty-one thousand, three hundred twenty-one".