31331322012 has 48 divisors (see below), whose sum is σ = 77043778560. Its totient is φ = 9882574848.

The previous prime is 31331321953. The next prime is 31331322023. The reversal of 31331322012 is 21022313313.

It is a self number, because there is not a number n which added to its sum of digits gives 31331322012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117148 + ... + 276380.

It is an arithmetic number, because the mean of its divisors is an integer number (1605078720).

Almost surely, 2^31331322012 is an apocalyptic number.

It is an amenable number.

31331322012 is an abundant number, since it is smaller than the sum of its proper divisors (45712456548).

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

31331322012 is a wasteful number, since it uses less digits than its factorization.

31331322012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160122 (or 160120 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31331322012 its reverse (21022313313), we get a palindrome (52353635325).

The spelling of 31331322012 in words is "thirty-one billion, three hundred thirty-one million, three hundred twenty-two thousand, twelve".