1143431213 has 2 divisors, whose sum is σ = 1143431214. Its totient is φ = 1143431212.

The previous prime is 1143431197. The next prime is 1143431231. The reversal of 1143431213 is 3121343411.

Together with next prime (1143431231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1140615529 + 2815684 = 33773^2 + 1678^2 .

It is a cyclic number.

It is not a de Polignac number, because 1143431213 - 2⁴ = 1143431197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1143401213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571715606 + 571715607.

It is an arithmetic number, because the mean of its divisors is an integer number (571715607).

Almost surely, 2^1143431213 is an apocalyptic number.

It is an amenable number.

1143431213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1143431213 is an equidigital number, since it uses as much as digits as its factorization.

1143431213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

The square root of 1143431213 is about 33814.6597350912. The cubic root of 1143431213 is about 1045.6909460257.

Adding to 1143431213 its reverse (3121343411), we get a palindrome (4264774624).

The spelling of 1143431213 in words is "one billion, one hundred forty-three million, four hundred thirty-one thousand, two hundred thirteen".