1031115220 has 12 divisors (see below), whose sum is σ = 2165342004. Its totient is φ = 412446080.

The previous prime is 1031115203. The next prime is 1031115233. The reversal of 1031115220 is 225111301.

It can be written as a sum of positive squares in 2 ways, for example, as 329712964 + 701402256 = 18158^2 + 26484^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1031115194 and 1031115203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25777861 + ... + 25777900.

It is an arithmetic number, because the mean of its divisors is an integer number (180445167).

Almost surely, 2^1031115220 is an apocalyptic number.

1031115220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1031115220 is an abundant number, since it is smaller than the sum of its proper divisors (1134226784).

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

1031115220 is a wasteful number, since it uses less digits than its factorization.

1031115220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51555770 (or 51555768 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 1031115220 is about 32110.9828563375. The cubic root of 1031115220 is about 1010.2659888274.

Adding to 1031115220 its reverse (225111301), we get a palindrome (1256226521).

The spelling of 1031115220 in words is "one billion, thirty-one million, one hundred fifteen thousand, two hundred twenty".