3131331220320 has 96 divisors (see below), whose sum is σ = 9955877557248. Its totient is φ = 827217704448.

The previous prime is 3131331220319. The next prime is 3131331220331. The reversal of 3131331220320 is 230221331313.

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

It is a super-2 number, since 2×3131331220320² (a number of 26 digits) contains 22 as substring.

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

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, 30432784 + ... + 30535503.

It is an arithmetic number, because the mean of its divisors is an integer number (103707057888).

Almost surely, 2^{3131331220320} is an apocalyptic number.

3131331220320 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3131331220320 is an abundant number, since it is smaller than the sum of its proper divisors (6824546336928).

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

3131331220320 is a wasteful number, since it uses less digits than its factorization.

3131331220320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60968412 (or 60968404 counting only the distinct ones).

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

Adding to 3131331220320 its reverse (230221331313), we get a palindrome (3361552551633).

The spelling of 3131331220320 in words is "three trillion, one hundred thirty-one billion, three hundred thirty-one million, two hundred twenty thousand, three hundred twenty".