31331212001000 has 64 divisors (see below), whose sum is σ = 73316880000000. Its totient is φ = 12532169601600.

The previous prime is 31331212000981. The next prime is 31331212001009. The reversal of 31331212001000 is 10021213313.

It is a self number, because there is not a number n which added to its sum of digits gives 31331212001000.

It is not an unprimeable number, because it can be changed into a prime (31331212001009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41626001 + ... + 42371999.

It is an arithmetic number, because the mean of its divisors is an integer number (1145576250000).

Almost surely, 2^{31331212001000} is an apocalyptic number.

It is an amenable number.

31331212001000 is an abundant number, since it is smaller than the sum of its proper divisors (41985667999000).

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

31331212001000 is a wasteful number, since it uses less digits than its factorization.

31331212001000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788019 (or 788005 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31331212001000 its reverse (10021213313), we get a palindrome (31341233214313).

The spelling of 31331212001000 in words is "thirty-one trillion, three hundred thirty-one billion, two hundred twelve million, one thousand".