1143305531 has 2 divisors, whose sum is σ = 1143305532. Its totient is φ = 1143305530.

The previous prime is 1143305509. The next prime is 1143305533. The reversal of 1143305531 is 1355033411.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1143305531 is a prime.

It is a super-2 number, since 2×1143305531² = 2614295074430383922, which contains 22 as substring.

Together with 1143305533, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1143305531.

It is not a weakly prime, because it can be changed into another prime (1143305533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571652765 + 571652766.

It is an arithmetic number, because the mean of its divisors is an integer number (571652766).

Almost surely, 2^1143305531 is an apocalyptic number.

1143305531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1143305531 is an equidigital number, since it uses as much as digits as its factorization.

1143305531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 1143305531 is about 33812.8012888610. The cubic root of 1143305531 is about 1045.6526317124.

Adding to 1143305531 its reverse (1355033411), we get a palindrome (2498338942).

The spelling of 1143305531 in words is "one billion, one hundred forty-three million, three hundred five thousand, five hundred thirty-one".