631606 has 4 divisors (see below), whose sum is σ = 947412. Its totient is φ = 315802.

The previous prime is 631597. The next prime is 631613. The reversal of 631606 is 606136.

631606 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×631606² = 797852278472, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157900 + ... + 157903.

It is an arithmetic number, because the mean of its divisors is an integer number (236853).

2⁶³¹⁶⁰⁶ is an apocalyptic number.

631606 is a deficient number, since it is larger than the sum of its proper divisors (315806).

631606 is a wasteful number, since it uses less digits than its factorization.

631606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315805.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 631606 is about 794.7364342976. The cubic root of 631606 is about 85.7989715936.

The spelling of 631606 in words is "six hundred thirty-one thousand, six hundred six".