631211212 has 24 divisors (see below), whose sum is σ = 1141425152. Its totient is φ = 305110800.

The previous prime is 631211183. The next prime is 631211219. The reversal of 631211212 is 212112136.

631211212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 631211212.

It is not an unprimeable number, because it can be changed into a prime (631211219) 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, 158113 + ... + 162055.

Almost surely, 2^631211212 is an apocalyptic number.

631211212 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

631211212 is a deficient number, since it is larger than the sum of its proper divisors (510213940).

631211212 is a wasteful number, since it uses less digits than its factorization.

631211212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5269 (or 5267 counting only the distinct ones).

The product of its digits is 144, while the sum is 19.

The square root of 631211212 is about 25123.9171308934. The cubic root of 631211212 is about 857.8109153117.

Adding to 631211212 its reverse (212112136), we get a palindrome (843323348).

The spelling of 631211212 in words is "six hundred thirty-one million, two hundred eleven thousand, two hundred twelve".