631306 has 8 divisors (see below), whose sum is σ = 1019844. Its totient is φ = 291360.

The previous prime is 631291. The next prime is 631307. The reversal of 631306 is 603136.

It is a happy number.

631306 is an esthetic number in base 8, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in 2 ways, for example, as 625681 + 5625 = 791^2 + 75^2 .

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

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12115 + ... + 12166.

2⁶³¹³⁰⁶ is an apocalyptic number.

631306 is a deficient number, since it is larger than the sum of its proper divisors (388538).

631306 is a wasteful number, since it uses less digits than its factorization.

631306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24296.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 631306 is about 794.5476700614. The cubic root of 631306 is about 85.7853851870.

It can be divided in two parts, 63130 and 6, that added together give a palindrome (63136).

The spelling of 631306 in words is "six hundred thirty-one thousand, three hundred six".