1143320989 has 2 divisors, whose sum is σ = 1143320990. Its totient is φ = 1143320988.

The previous prime is 1143320977. The next prime is 1143321059. The reversal of 1143320989 is 9890233411.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1117899225 + 25421764 = 33435^2 + 5042^2 .

It is an emirp because it is prime and its reverse (9890233411) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1143320989 - 2¹⁷ = 1143189917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1143320089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571660494 + 571660495.

It is an arithmetic number, because the mean of its divisors is an integer number (571660495).

Almost surely, 2^1143320989 is an apocalyptic number.

It is an amenable number.

1143320989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1143320989 is an equidigital number, since it uses as much as digits as its factorization.

1143320989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 1143320989 is about 33813.0298701551. The cubic root of 1143320989 is about 1045.6573442543.

The spelling of 1143320989 in words is "one billion, one hundred forty-three million, three hundred twenty thousand, nine hundred eighty-nine".