631213 has 4 divisors (see below), whose sum is σ = 688608. Its totient is φ = 573820.

The previous prime is 631187. The next prime is 631223. The reversal of 631213 is 312136.

631213 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 631213 - 2⁵ = 631181 is a prime.

It is a Duffinian number.

631213 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28681 + ... + 28702.

It is an arithmetic number, because the mean of its divisors is an integer number (172152).

2⁶³¹²¹³ is an apocalyptic number.

It is an amenable number.

631213 is a deficient number, since it is larger than the sum of its proper divisors (57395).

631213 is a wasteful number, since it uses less digits than its factorization.

631213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57394.

The product of its digits is 108, while the sum is 16.

The square root of 631213 is about 794.4891440416. The cubic root of 631213 is about 85.7811725270.

Adding to 631213 its reverse (312136), we get a palindrome (943349).

The spelling of 631213 in words is "six hundred thirty-one thousand, two hundred thirteen".