313231220 has 24 divisors (see below), whose sum is σ = 660618504. Its totient is φ = 124752896.

The previous prime is 313231213. The next prime is 313231241. The reversal of 313231220 is 22132313.

It can be written as a sum of positive squares in 4 ways, for example, as 46758244 + 266472976 = 6838^2 + 16324^2 .

It is a super-2 number, since 2×313231220² = 196227594365376800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28949 + ... + 38268.

It is an arithmetic number, because the mean of its divisors is an integer number (27525771).

Almost surely, 2^313231220 is an apocalyptic number.

It is an amenable number.

313231220 is an abundant number, since it is smaller than the sum of its proper divisors (347387284).

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

313231220 is a wasteful number, since it uses less digits than its factorization.

313231220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67459 (or 67457 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 313231220 is about 17698.3394701311. The cubic root of 313231220 is about 679.1332815754.

Adding to 313231220 its reverse (22132313), we get a palindrome (335363533).

The spelling of 313231220 in words is "three hundred thirteen million, two hundred thirty-one thousand, two hundred twenty".