142656509 has 2 divisors, whose sum is σ = 142656510. Its totient is φ = 142656508.

The previous prime is 142656457. The next prime is 142656517. The reversal of 142656509 is 905656241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112296409 + 30360100 = 10597^2 + 5510^2 .

It is a cyclic number.

It is not a de Polignac number, because 142656509 - 2¹² = 142652413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142656559) 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, 71328254 + 71328255.

It is an arithmetic number, because the mean of its divisors is an integer number (71328255).

Almost surely, 2^142656509 is an apocalyptic number.

It is an amenable number.

142656509 is a deficient number, since it is larger than the sum of its proper divisors (1).

142656509 is an equidigital number, since it uses as much as digits as its factorization.

142656509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 142656509 is about 11943.8900279599. The cubic root of 142656509 is about 522.5131170444.

The spelling of 142656509 in words is "one hundred forty-two million, six hundred fifty-six thousand, five hundred nine".