142668917 has 2 divisors, whose sum is σ = 142668918. Its totient is φ = 142668916.

The previous prime is 142668857. The next prime is 142668919. The reversal of 142668917 is 719866241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110019121 + 32649796 = 10489^2 + 5714^2 .

It is a cyclic number.

It is not a de Polignac number, because 142668917 - 2²⁰ = 141620341 is a prime.

Together with 142668919, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142668919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71334458 + 71334459.

It is an arithmetic number, because the mean of its divisors is an integer number (71334459).

Almost surely, 2^142668917 is an apocalyptic number.

It is an amenable number.

142668917 is a deficient number, since it is larger than the sum of its proper divisors (1).

142668917 is an equidigital number, since it uses as much as digits as its factorization.

142668917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The square root of 142668917 is about 11944.4094454268. The cubic root of 142668917 is about 522.5282656809.

The spelling of 142668917 in words is "one hundred forty-two million, six hundred sixty-eight thousand, nine hundred seventeen".