142193309 has 2 divisors, whose sum is σ = 142193310. Its totient is φ = 142193308.

The previous prime is 142193281. The next prime is 142193339. The reversal of 142193309 is 903391241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135792409 + 6400900 = 11653^2 + 2530^2 .

It is a cyclic number.

It is not a de Polignac number, because 142193309 - 2⁸ = 142193053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142193339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71096654 + 71096655.

It is an arithmetic number, because the mean of its divisors is an integer number (71096655).

Almost surely, 2^142193309 is an apocalyptic number.

It is an amenable number.

142193309 is a deficient number, since it is larger than the sum of its proper divisors (1).

142193309 is an equidigital number, since it uses as much as digits as its factorization.

142193309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 142193309 is about 11924.4835946887. The cubic root of 142193309 is about 521.9469774342.

The spelling of 142193309 in words is "one hundred forty-two million, one hundred ninety-three thousand, three hundred nine".