31143033312 has 96 divisors (see below), whose sum is σ = 87778785024. Its totient is φ = 9632716800.

The previous prime is 31143033283. The next prime is 31143033319. The reversal of 31143033312 is 21333034113.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31143033319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18514 + ... + 250257.

It is an arithmetic number, because the mean of its divisors is an integer number (914362344).

Almost surely, 2^31143033312 is an apocalyptic number.

31143033312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31143033312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43889392512).

31143033312 is an abundant number, since it is smaller than the sum of its proper divisors (56635751712).

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

31143033312 is a wasteful number, since it uses less digits than its factorization.

31143033312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268872 (or 268864 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 24.

Adding to 31143033312 its reverse (21333034113), we get a palindrome (52476067425).

The spelling of 31143033312 in words is "thirty-one billion, one hundred forty-three million, thirty-three thousand, three hundred twelve".