142433309 has 2 divisors, whose sum is σ = 142433310. Its totient is φ = 142433308.

The previous prime is 142433261. The next prime is 142433321. The reversal of 142433309 is 903334241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72760900 + 69672409 = 8530^2 + 8347^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142433309 is a prime.

It is a Sophie Germain prime.

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 (142433399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71216654 + 71216655.

It is an arithmetic number, because the mean of its divisors is an integer number (71216655).

Almost surely, 2^142433309 is an apocalyptic number.

It is an amenable number.

142433309 is a deficient number, since it is larger than the sum of its proper divisors (1).

142433309 is an equidigital number, since it uses as much as digits as its factorization.

142433309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 142433309 is about 11934.5426808068. The cubic root of 142433309 is about 522.2404672481.

The spelling of 142433309 in words is "one hundred forty-two million, four hundred thirty-three thousand, three hundred nine".