641231 has 4 divisors (see below), whose sum is σ = 675000. Its totient is φ = 607464.

The previous prime is 641227. The next prime is 641239. The reversal of 641231 is 132146.

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 641231 - 2² = 641227 is a prime.

It is a super-2 number, since 2×641231² = 822354390722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16856 + ... + 16893.

It is an arithmetic number, because the mean of its divisors is an integer number (168750).

2⁶⁴¹²³¹ is an apocalyptic number.

641231 is a deficient number, since it is larger than the sum of its proper divisors (33769).

641231 is a wasteful number, since it uses less digits than its factorization.

641231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33768.

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

The square root of 641231 is about 800.7690053942. The cubic root of 641231 is about 86.2326044873.

Adding to 641231 its reverse (132146), we get a palindrome (773377).

The spelling of 641231 in words is "six hundred forty-one thousand, two hundred thirty-one".