1131011220 has 24 divisors (see below), whose sum is σ = 3166831584. Its totient is φ = 301602976.

The previous prime is 1131011209. The next prime is 1131011239. The reversal of 1131011220 is 221101311.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1131011196 and 1131011205.

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, 9425034 + ... + 9425153.

It is an arithmetic number, because the mean of its divisors is an integer number (131951316).

Almost surely, 2^1131011220 is an apocalyptic number.

1131011220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131011220 is an abundant number, since it is smaller than the sum of its proper divisors (2035820364).

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

1131011220 is a wasteful number, since it uses less digits than its factorization.

1131011220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18850199 (or 18850197 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 1131011220 is about 33630.5102548266. The cubic root of 1131011220 is about 1041.8910428941.

Adding to 1131011220 its reverse (221101311), we get a palindrome (1352112531).

Subtracting from 1131011220 its reverse (221101311), we obtain a palindrome (909909909).

The spelling of 1131011220 in words is "one billion, one hundred thirty-one million, eleven thousand, two hundred twenty".