68121617 has 2 divisors, whose sum is σ = 68121618. Its totient is φ = 68121616.

The previous prime is 68121611. The next prime is 68121643. The reversal of 68121617 is 71612186.

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., 66846976 + 1274641 = 8176^2 + 1129^2 .

It is a cyclic number.

It is not a de Polignac number, because 68121617 - 2⁶ = 68121553 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68121611) 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, 34060808 + 34060809.

It is an arithmetic number, because the mean of its divisors is an integer number (34060809).

Almost surely, 2^68121617 is an apocalyptic number.

It is an amenable number.

68121617 is a deficient number, since it is larger than the sum of its proper divisors (1).

68121617 is an equidigital number, since it uses as much as digits as its factorization.

68121617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 32.

The square root of 68121617 is about 8253.5820708345. The cubic root of 68121617 is about 408.4086979409.

The spelling of 68121617 in words is "sixty-eight million, one hundred twenty-one thousand, six hundred seventeen".