142808509 has 2 divisors, whose sum is σ = 142808510. Its totient is φ = 142808508.

The previous prime is 142808507. The next prime is 142808539. The reversal of 142808509 is 905808241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107702884 + 35105625 = 10378^2 + 5925^2 .

It is a cyclic number.

It is not a de Polignac number, because 142808509 - 2¹ = 142808507 is a prime.

Together with 142808507, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142808507) 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, 71404254 + 71404255.

It is an arithmetic number, because the mean of its divisors is an integer number (71404255).

Almost surely, 2^142808509 is an apocalyptic number.

It is an amenable number.

142808509 is a deficient number, since it is larger than the sum of its proper divisors (1).

142808509 is an equidigital number, since it uses as much as digits as its factorization.

142808509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 142808509 is about 11950.2514199493. The cubic root of 142808509 is about 522.6986297912.

The spelling of 142808509 in words is "one hundred forty-two million, eight hundred eight thousand, five hundred nine".