142668689 has 2 divisors, whose sum is σ = 142668690. Its totient is φ = 142668688.

The previous prime is 142668679. The next prime is 142668731. The reversal of 142668689 is 986866241.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134212225 + 8456464 = 11585^2 + 2908^2 .

It is a cyclic number.

It is not a de Polignac number, because 142668689 - 2⁸ = 142668433 is a prime.

It is not a weakly prime, because it can be changed into another prime (142668619) 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, 71334344 + 71334345.

It is an arithmetic number, because the mean of its divisors is an integer number (71334345).

Almost surely, 2^142668689 is an apocalyptic number.

It is an amenable number.

142668689 is a deficient number, since it is larger than the sum of its proper divisors (1).

142668689 is an equidigital number, since it uses as much as digits as its factorization.

142668689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 995328, while the sum is 50.

The square root of 142668689 is about 11944.3999012089. The cubic root of 142668689 is about 522.5279873289.

The spelling of 142668689 in words is "one hundred forty-two million, six hundred sixty-eight thousand, six hundred eighty-nine".