142130309 has 2 divisors, whose sum is σ = 142130310. Its totient is φ = 142130308.

The previous prime is 142130299. The next prime is 142130321. The reversal of 142130309 is 903031241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141681409 + 448900 = 11903^2 + 670^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142130309 is a prime.

It is a Sophie Germain prime.

It is a Chen 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 (142130389) 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, 71065154 + 71065155.

It is an arithmetic number, because the mean of its divisors is an integer number (71065155).

Almost surely, 2^142130309 is an apocalyptic number.

It is an amenable number.

142130309 is a deficient number, since it is larger than the sum of its proper divisors (1).

142130309 is an equidigital number, since it uses as much as digits as its factorization.

142130309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 142130309 is about 11921.8416781972. The cubic root of 142130309 is about 521.8698816427.

The spelling of 142130309 in words is "one hundred forty-two million, one hundred thirty thousand, three hundred nine".