3131220312 has 96 divisors (see below), whose sum is σ = 9501457680. Its totient is φ = 923201280.

The previous prime is 3131220271. The next prime is 3131220331. The reversal of 3131220312 is 2130221313.

3131220312 is a `hidden beast` number, since 3 + 131 + 220 + 312 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24123 + ... + 82730.

Almost surely, 2^3131220312 is an apocalyptic number.

It is an amenable number.

3131220312 is an abundant number, since it is smaller than the sum of its proper divisors (6370237368).

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

3131220312 is a wasteful number, since it uses less digits than its factorization.

3131220312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106913 (or 106906 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 3131220312 is about 55957.3079409651. The cubic root of 3131220312 is about 1462.9782690006.

Adding to 3131220312 its reverse (2130221313), we get a palindrome (5261441625).

The spelling of 3131220312 in words is "three billion, one hundred thirty-one million, two hundred twenty thousand, three hundred twelve".