143509 has 2 divisors, whose sum is σ = 143510. Its totient is φ = 143508.

The previous prime is 143503. The next prime is 143513. The reversal of 143509 is 905341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142884 + 625 = 378^2 + 25^2 .

It is a cyclic number.

It is not a de Polignac number, because 143509 - 2³ = 143501 is a prime.

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 143509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71754 + 71755.

It is an arithmetic number, because the mean of its divisors is an integer number (71755).

2¹⁴³⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

143509 is a deficient number, since it is larger than the sum of its proper divisors (1).

143509 is an equidigital number, since it uses as much as digits as its factorization.

143509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 143509 is about 378.8258174940. The cubic root of 143509 is about 52.3551867116.

The spelling of 143509 in words is "one hundred forty-three thousand, five hundred nine".