631353631212 has 18 divisors (see below), whose sum is σ = 1595921678988. Its totient is φ = 210451210392.

The previous prime is 631353631193. The next prime is 631353631273. The reversal of 631353631212 is 212136353136.

631353631212 is a `hidden beast` number, since 6 + 3 + 1 + 3 + 5 + 3 + 631 + 2 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 17537600867 = 631353631212 / (6 + 3 + 1 + 3 + 5 + 3 + 6 + 3 + 1 + 2 + 1 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8768800398 + ... + 8768800469.

Almost surely, 2^631353631212 is an apocalyptic number.

It is an amenable number.

631353631212 is an abundant number, since it is smaller than the sum of its proper divisors (964568047776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

631353631212 is a wasteful number, since it uses less digits than its factorization.

631353631212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17537600877 (or 17537600872 counting only the distinct ones).

The product of its digits is 58320, while the sum is 36.

Adding to 631353631212 its reverse (212136353136), we get a palindrome (843489984348).

The spelling of 631353631212 in words is "six hundred thirty-one billion, three hundred fifty-three million, six hundred thirty-one thousand, two hundred twelve".