1143115220 has 24 divisors (see below), whose sum is σ = 2585199624. Its totient is φ = 422073216.

The previous prime is 1143115213. The next prime is 1143115223. The reversal of 1143115220 is 225113411.

It can be written as a sum of positive squares in 4 ways, for example, as 30492484 + 1112622736 = 5522^2 + 33356^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1143115192 and 1143115201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143115223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2198039 + ... + 2198558.

It is an arithmetic number, because the mean of its divisors is an integer number (107716651).

Almost surely, 2^1143115220 is an apocalyptic number.

1143115220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1143115220 is an abundant number, since it is smaller than the sum of its proper divisors (1442084404).

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

1143115220 is a wasteful number, since it uses less digits than its factorization.

1143115220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4396619 (or 4396617 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1143115220 is about 33809.9869860963. The cubic root of 1143115220 is about 1045.5946098232.

Adding to 1143115220 its reverse (225113411), we get a palindrome (1368228631).

The spelling of 1143115220 in words is "one billion, one hundred forty-three million, one hundred fifteen thousand, two hundred twenty".