1131220244 has 24 divisors (see below), whose sum is σ = 2468117568. Its totient is φ = 440735040.

The previous prime is 1131220241. The next prime is 1131220249. The reversal of 1131220244 is 4420221311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131220241) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1836089 + ... + 1836704.

It is an arithmetic number, because the mean of its divisors is an integer number (102838232).

Almost surely, 2^1131220244 is an apocalyptic number.

1131220244 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1131220244 is an abundant number, since it is smaller than the sum of its proper divisors (1336897324).

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

1131220244 is a wasteful number, since it uses less digits than its factorization.

1131220244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3672815 (or 3672813 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1131220244 is about 33633.6177655631. The cubic root of 1131220244 is about 1041.9552234594.

Adding to 1131220244 its reverse (4420221311), we get a palindrome (5551441555).

The spelling of 1131220244 in words is "one billion, one hundred thirty-one million, two hundred twenty thousand, two hundred forty-four".