143189309 has 2 divisors, whose sum is σ = 143189310. Its totient is φ = 143189308.

The previous prime is 143189303. The next prime is 143189311. The reversal of 143189309 is 903981341.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137405284 + 5784025 = 11722^2 + 2405^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-143189309 is a prime.

It is a Sophie Germain prime.

Together with 143189311, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143189303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71594654 + 71594655.

It is an arithmetic number, because the mean of its divisors is an integer number (71594655).

Almost surely, 2^143189309 is an apocalyptic number.

It is an amenable number.

143189309 is a deficient number, since it is larger than the sum of its proper divisors (1).

143189309 is an equidigital number, since it uses as much as digits as its factorization.

143189309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 143189309 is about 11966.1735320862. The cubic root of 143189309 is about 523.1628107753.

The spelling of 143189309 in words is "one hundred forty-three million, one hundred eighty-nine thousand, three hundred nine".