142107209 has 2 divisors, whose sum is σ = 142107210. Its totient is φ = 142107208.

The previous prime is 142107197. The next prime is 142107239. The reversal of 142107209 is 902701241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127690000 + 14417209 = 11300^2 + 3797^2 .

It is a cyclic number.

It is not a de Polignac number, because 142107209 - 2⁸ = 142106953 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (142107239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71053604 + 71053605.

It is an arithmetic number, because the mean of its divisors is an integer number (71053605).

Almost surely, 2^142107209 is an apocalyptic number.

It is an amenable number.

142107209 is a deficient number, since it is larger than the sum of its proper divisors (1).

142107209 is an equidigital number, since it uses as much as digits as its factorization.

142107209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 142107209 is about 11920.8728287823. The cubic root of 142107209 is about 521.8416074777.

The spelling of 142107209 in words is "one hundred forty-two million, one hundred seven thousand, two hundred nine".