3131213120 has 112 divisors (see below), whose sum is σ = 8569561728. Its totient is φ = 1067489280.

The previous prime is 3131213117. The next prime is 3131213147. The reversal of 3131213120 is 213121313.

It is a tau number, because it is divible by the number of its divisors (112).

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, 401579 + ... + 409301.

It is an arithmetic number, because the mean of its divisors is an integer number (76513944).

Almost surely, 2^3131213120 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 3131213120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4284780864).

3131213120 is an abundant number, since it is smaller than the sum of its proper divisors (5438348608).

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

3131213120 is a wasteful number, since it uses less digits than its factorization.

3131213120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7928 (or 7918 counting only the distinct ones).

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

The square root of 3131213120 is about 55957.2436776509. The cubic root of 3131213120 is about 1462.9771489103.

Adding to 3131213120 its reverse (213121313), we get a palindrome (3344334433).

The spelling of 3131213120 in words is "three billion, one hundred thirty-one million, two hundred thirteen thousand, one hundred twenty".