1143531243 has 8 divisors (see below), whose sum is σ = 1694120400. Its totient is φ = 762354144.

The previous prime is 1143531229. The next prime is 1143531313. The reversal of 1143531243 is 3421353411.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1143531243 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 42353009 = 1143531243 / (1 + 1 + 4 + 3 + 5 + 3 + 1 + 2 + 4 + 3).

It is not an unprimeable number, because it can be changed into a prime (1143531223) 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, 21176478 + ... + 21176531.

It is an arithmetic number, because the mean of its divisors is an integer number (211765050).

Almost surely, 2^1143531243 is an apocalyptic number.

1143531243 is a deficient number, since it is larger than the sum of its proper divisors (550589157).

1143531243 is an equidigital number, since it uses as much as digits as its factorization.

1143531243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42353018 (or 42353012 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 1143531243 is about 33816.1387949600. The cubic root of 1143531243 is about 1045.7214382885.

Adding to 1143531243 its reverse (3421353411), we get a palindrome (4564884654).

The spelling of 1143531243 in words is "one billion, one hundred forty-three million, five hundred thirty-one thousand, two hundred forty-three".