1143568321 has 6 divisors (see below), whose sum is σ = 1330273410. Its totient is φ = 980201376.

The previous prime is 1143568319. The next prime is 1143568357. The reversal of 1143568321 is 1238653411.

It can be written as a sum of positive squares in only one way, i.e., 1118166721 + 25401600 = 33439^2 + 5040^2 .

It is not a de Polignac number, because 1143568321 - 2¹ = 1143568319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1143568381) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11669016 + ... + 11669113.

It is an arithmetic number, because the mean of its divisors is an integer number (221712235).

Almost surely, 2^1143568321 is an apocalyptic number.

It is an amenable number.

1143568321 is a deficient number, since it is larger than the sum of its proper divisors (186705089).

1143568321 is an equidigital number, since it uses as much as digits as its factorization.

1143568321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23338143 (or 23338136 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 1143568321 is about 33816.6870198723. The cubic root of 1143568321 is about 1045.7327403672.

The spelling of 1143568321 in words is "one billion, one hundred forty-three million, five hundred sixty-eight thousand, three hundred twenty-one".