142844509 has 2 divisors, whose sum is σ = 142844510. Its totient is φ = 142844508.

The previous prime is 142844501. The next prime is 142844519. The reversal of 142844509 is 905448241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132940900 + 9903609 = 11530^2 + 3147^2 .

It is an emirp because it is prime and its reverse (905448241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142844509 - 2³ = 142844501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142844501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71422254 + 71422255.

It is an arithmetic number, because the mean of its divisors is an integer number (71422255).

Almost surely, 2^142844509 is an apocalyptic number.

It is an amenable number.

142844509 is a deficient number, since it is larger than the sum of its proper divisors (1).

142844509 is an equidigital number, since it uses as much as digits as its factorization.

142844509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 142844509 is about 11951.7575694958. The cubic root of 142844509 is about 522.7425477385.

The spelling of 142844509 in words is "one hundred forty-two million, eight hundred forty-four thousand, five hundred nine".