31531412212 has 12 divisors (see below), whose sum is σ = 55193621056. Its totient is φ = 15761806200.

The previous prime is 31531412207. The next prime is 31531412219. The reversal of 31531412212 is 21221413513.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31531412219) 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, 956748 + ... + 989155.

Almost surely, 2^31531412212 is an apocalyptic number.

It is an amenable number.

31531412212 is a deficient number, since it is larger than the sum of its proper divisors (23662208844).

31531412212 is a wasteful number, since it uses less digits than its factorization.

31531412212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949958 (or 1949956 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

Adding to 31531412212 its reverse (21221413513), we get a palindrome (52752825725).

The spelling of 31531412212 in words is "thirty-one billion, five hundred thirty-one million, four hundred twelve thousand, two hundred twelve".