641731 has 8 divisors (see below), whose sum is σ = 671744. Its totient is φ = 612360.

The previous prime is 641713. The next prime is 641747. The reversal of 641731 is 137146.

641731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 641731 - 2¹⁹ = 117443 is a prime.

It is a super-2 number, since 2×641731² = 823637352722, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (641701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3856 + ... + 4018.

It is an arithmetic number, because the mean of its divisors is an integer number (83968).

2⁶⁴¹⁷³¹ is an apocalyptic number.

641731 is a deficient number, since it is larger than the sum of its proper divisors (30013).

641731 is a wasteful number, since it uses less digits than its factorization.

641731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321.

The product of its digits is 504, while the sum is 22.

The square root of 641731 is about 801.0811444542. The cubic root of 641731 is about 86.2550119611.

Adding to 641731 its reverse (137146), we get a palindrome (778877).

The spelling of 641731 in words is "six hundred forty-one thousand, seven hundred thirty-one".