631646 has 8 divisors (see below), whose sum is σ = 970704. Its totient is φ = 308080.

The previous prime is 631643. The next prime is 631667. The reversal of 631646 is 646136.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631643) 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, 3770 + ... + 3933.

It is an arithmetic number, because the mean of its divisors is an integer number (121338).

2⁶³¹⁶⁴⁶ is an apocalyptic number.

631646 is a deficient number, since it is larger than the sum of its proper divisors (339058).

631646 is a wasteful number, since it uses less digits than its factorization.

631646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7746.

The product of its digits is 2592, while the sum is 26.

The square root of 631646 is about 794.7615994750. The cubic root of 631646 is about 85.8007827894.

The spelling of 631646 in words is "six hundred thirty-one thousand, six hundred forty-six".