142747909 has 2 divisors, whose sum is σ = 142747910. Its totient is φ = 142747908.

The previous prime is 142747907. The next prime is 142747981. The reversal of 142747909 is 909747241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120450625 + 22297284 = 10975^2 + 4722^2 .

It is a cyclic number.

It is not a de Polignac number, because 142747909 - 2¹ = 142747907 is a prime.

Together with 142747907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142747903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71373954 + 71373955.

It is an arithmetic number, because the mean of its divisors is an integer number (71373955).

Almost surely, 2^142747909 is an apocalyptic number.

It is an amenable number.

142747909 is a deficient number, since it is larger than the sum of its proper divisors (1).

142747909 is an equidigital number, since it uses as much as digits as its factorization.

142747909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 142747909 is about 11947.7156394015. The cubic root of 142747909 is about 522.6246845745.

The spelling of 142747909 in words is "one hundred forty-two million, seven hundred forty-seven thousand, nine hundred nine".