1143031220 has 24 divisors (see below), whose sum is σ = 2404438344. Its totient is φ = 456436736.

The previous prime is 1143031213. The next prime is 1143031223. The reversal of 1143031220 is 221303411.

It can be written as a sum of positive squares in 4 ways, for example, as 287234704 + 855796516 = 16948^2 + 29254^2 .

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143031223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36329 + ... + 60048.

It is an arithmetic number, because the mean of its divisors is an integer number (100184931).

Almost surely, 2^1143031220 is an apocalyptic number.

1143031220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1143031220 is an abundant number, since it is smaller than the sum of its proper divisors (1261407124).

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

1143031220 is a wasteful number, since it uses less digits than its factorization.

1143031220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96979 (or 96977 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1143031220 is about 33808.7447267715. The cubic root of 1143031220 is about 1045.5689979114.

Adding to 1143031220 its reverse (221303411), we get a palindrome (1364334631).

The spelling of 1143031220 in words is "one billion, one hundred forty-three million, thirty-one thousand, two hundred twenty".