31331231012 has 6 divisors (see below), whose sum is σ = 54829654278. Its totient is φ = 15665615504.

The previous prime is 31331230991. The next prime is 31331231023. The reversal of 31331231012 is 21013213313.

It can be written as a sum of positive squares in only one way, i.e., 29589504256 + 1741726756 = 172016^2 + 41734^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3916403873 + ... + 3916403880.

It is an arithmetic number, because the mean of its divisors is an integer number (9138275713).

Almost surely, 2^31331231012 is an apocalyptic number.

It is an amenable number.

31331231012 is a deficient number, since it is larger than the sum of its proper divisors (23498423266).

31331231012 is a wasteful number, since it uses less digits than its factorization.

31331231012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7832807757 (or 7832807755 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31331231012 its reverse (21013213313), we get a palindrome (52344444325).

The spelling of 31331231012 in words is "thirty-one billion, three hundred thirty-one million, two hundred thirty-one thousand, twelve".