142248209 has 2 divisors, whose sum is σ = 142248210. Its totient is φ = 142248208.

The previous prime is 142248199. The next prime is 142248217. The reversal of 142248209 is 902842241.

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., 71351809 + 70896400 = 8447^2 + 8420^2 .

It is a cyclic number.

It is not a de Polignac number, because 142248209 - 2²⁰ = 141199633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (142248289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71124104 + 71124105.

It is an arithmetic number, because the mean of its divisors is an integer number (71124105).

Almost surely, 2^142248209 is an apocalyptic number.

It is an amenable number.

142248209 is a deficient number, since it is larger than the sum of its proper divisors (1).

142248209 is an equidigital number, since it uses as much as digits as its factorization.

142248209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 142248209 is about 11926.7853590144. The cubic root of 142248209 is about 522.0141423433.

The spelling of 142248209 in words is "one hundred forty-two million, two hundred forty-eight thousand, two hundred nine".