1131313023220 has 24 divisors (see below), whose sum is σ = 2420582961384. Its totient is φ = 443986997376.

The previous prime is 1131313023199. The next prime is 1131313023229. The reversal of 1131313023220 is 223203131311.

It can be written as a sum of positive squares in 4 ways, for example, as 340817769616 + 790495253604 = 583796^2 + 889098^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1131313023191 and 1131313023200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131313023229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 533637159 + ... + 533639278.

It is an arithmetic number, because the mean of its divisors is an integer number (100857623391).

Almost surely, 2^{1131313023220} is an apocalyptic number.

1131313023220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131313023220 is an abundant number, since it is smaller than the sum of its proper divisors (1289269938164).

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

1131313023220 is a wasteful number, since it uses less digits than its factorization.

1131313023220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1067276499 (or 1067276497 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 1131313023220 its reverse (223203131311), we get a palindrome (1354516154531).

The spelling of 1131313023220 in words is "one trillion, one hundred thirty-one billion, three hundred thirteen million, twenty-three thousand, two hundred twenty".