31313101220 has 12 divisors (see below), whose sum is σ = 65757512604. Its totient is φ = 12525240480.

The previous prime is 31313101207. The next prime is 31313101249. The reversal of 31313101220 is 2210131313.

It can be written as a sum of positive squares in 2 ways, for example, as 4335695716 + 26977405504 = 65846^2 + 164248^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 782827511 + ... + 782827550.

It is an arithmetic number, because the mean of its divisors is an integer number (5479792717).

Almost surely, 2^31313101220 is an apocalyptic number.

It is an amenable number.

31313101220 is an abundant number, since it is smaller than the sum of its proper divisors (34444411384).

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

31313101220 is a wasteful number, since it uses less digits than its factorization.

31313101220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565655070 (or 1565655068 counting only the distinct ones).

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

Adding to 31313101220 its reverse (2210131313), we get a palindrome (33523232533).

The spelling of 31313101220 in words is "thirty-one billion, three hundred thirteen million, one hundred one thousand, two hundred twenty".