142020509 has 2 divisors, whose sum is σ = 142020510. Its totient is φ = 142020508.

The previous prime is 142020481. The next prime is 142020521. The reversal of 142020509 is 905020241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115498009 + 26522500 = 10747^2 + 5150^2 .

It is a cyclic number.

It is not a de Polignac number, because 142020509 - 2¹⁶ = 141954973 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142020589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71010254 + 71010255.

It is an arithmetic number, because the mean of its divisors is an integer number (71010255).

Almost surely, 2^142020509 is an apocalyptic number.

It is an amenable number.

142020509 is a deficient number, since it is larger than the sum of its proper divisors (1).

142020509 is an equidigital number, since it uses as much as digits as its factorization.

142020509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 142020509 is about 11917.2357952673. The cubic root of 142020509 is about 521.7354602201.

The spelling of 142020509 in words is "one hundred forty-two million, twenty thousand, five hundred nine".