142195409 has 2 divisors, whose sum is σ = 142195410. Its totient is φ = 142195408.

The previous prime is 142195399. The next prime is 142195441. The reversal of 142195409 is 904591241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94031809 + 48163600 = 9697^2 + 6940^2 .

It is a cyclic number.

It is not a de Polignac number, because 142195409 - 2⁴ = 142195393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (142195309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71097704 + 71097705.

It is an arithmetic number, because the mean of its divisors is an integer number (71097705).

Almost surely, 2^142195409 is an apocalyptic number.

It is an amenable number.

142195409 is a deficient number, since it is larger than the sum of its proper divisors (1).

142195409 is an equidigital number, since it uses as much as digits as its factorization.

142195409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 142195409 is about 11924.5716484912. The cubic root of 142195409 is about 521.9495469017.

The spelling of 142195409 in words is "one hundred forty-two million, one hundred ninety-five thousand, four hundred nine".