68312789 has 2 divisors, whose sum is σ = 68312790. Its totient is φ = 68312788.

The previous prime is 68312753. The next prime is 68312791. The reversal of 68312789 is 98721386.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66699889 + 1612900 = 8167^2 + 1270^2 .

It is a cyclic number.

It is not a de Polignac number, because 68312789 - 2⁸ = 68312533 is a prime.

Together with 68312791, 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 (68312729) 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, 34156394 + 34156395.

It is an arithmetic number, because the mean of its divisors is an integer number (34156395).

Almost surely, 2^68312789 is an apocalyptic number.

It is an amenable number.

68312789 is a deficient number, since it is larger than the sum of its proper divisors (1).

68312789 is an equidigital number, since it uses as much as digits as its factorization.

68312789 is an odious number, because the sum of its binary digits is odd.

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

The square root of 68312789 is about 8265.1551104622. The cubic root of 68312789 is about 408.7903848348.

The spelling of 68312789 in words is "sixty-eight million, three hundred twelve thousand, seven hundred eighty-nine".