It is a happy number.
It is a congruent number.
It is an unprimeable number.
Almost surely, 231215355431132 is an apocalyptic number.
It is an amenable number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
31215355431132 is a wasteful number, since it uses less digits than its factorization.
31215355431132 is an evil number, because the sum of its binary digits is even.
The spelling of 31215355431132 in words is "thirty-one trillion, two hundred fifteen billion, three hundred fifty-five million, four hundred thirty-one thousand, one hundred thirty-two".