31203231312 has 160 divisors (see below), whose sum is σ = 90827758080. Its totient is φ = 9147548160.

The previous prime is 31203231307. The next prime is 31203231317. The reversal of 31203231312 is 21313230213.

It is an interprime number because it is at equal distance from previous prime (31203231307) and next prime (31203231317).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31203231317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3492483 + ... + 3501405.

It is an arithmetic number, because the mean of its divisors is an integer number (567673488).

Almost surely, 2^31203231312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31203231312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45413879040).

31203231312 is an abundant number, since it is smaller than the sum of its proper divisors (59624526768).

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

31203231312 is a wasteful number, since it uses less digits than its factorization.

31203231312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9161 (or 9155 counting only the distinct ones).

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

Adding to 31203231312 its reverse (21313230213), we get a palindrome (52516461525).

The spelling of 31203231312 in words is "thirty-one billion, two hundred three million, two hundred thirty-one thousand, three hundred twelve".