142757809 has 2 divisors, whose sum is σ = 142757810. Its totient is φ = 142757808.

The previous prime is 142757737. The next prime is 142757827. The reversal of 142757809 is 908757241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93547584 + 49210225 = 9672^2 + 7015^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142757809 is a prime.

It is not a weakly prime, because it can be changed into another prime (142757899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71378904 + 71378905.

It is an arithmetic number, because the mean of its divisors is an integer number (71378905).

Almost surely, 2^142757809 is an apocalyptic number.

It is an amenable number.

142757809 is a deficient number, since it is larger than the sum of its proper divisors (1).

142757809 is an equidigital number, since it uses as much as digits as its factorization.

142757809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141120, while the sum is 43.

The square root of 142757809 is about 11948.1299373584. The cubic root of 142757809 is about 522.6367661636.

The spelling of 142757809 in words is "one hundred forty-two million, seven hundred fifty-seven thousand, eight hundred nine".