631641 has 8 divisors (see below), whose sum is σ = 846144. Its totient is φ = 419120.

The previous prime is 631619. The next prime is 631643. The reversal of 631641 is 146136.

631641 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 631641 - 2⁶ = 631577 is a prime.

631641 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (631643) 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, 595 + ... + 1271.

It is an arithmetic number, because the mean of its divisors is an integer number (105768).

2⁶³¹⁶⁴¹ is an apocalyptic number.

It is an amenable number.

631641 is a deficient number, since it is larger than the sum of its proper divisors (214503).

631641 is a wasteful number, since it uses less digits than its factorization.

631641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991.

The product of its digits is 432, while the sum is 21.

The square root of 631641 is about 794.7584538714. The cubic root of 631641 is about 85.8005563942.

Adding to 631641 its reverse (146136), we get a palindrome (777777).

The spelling of 631641 in words is "six hundred thirty-one thousand, six hundred forty-one".