68917517 has 2 divisors, whose sum is σ = 68917518. Its totient is φ = 68917516.

The previous prime is 68917501. The next prime is 68917529. The reversal of 68917517 is 71571986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56987401 + 11930116 = 7549^2 + 3454^2 .

It is a cyclic number.

It is not a de Polignac number, because 68917517 - 2⁴ = 68917501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68917567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34458758 + 34458759.

It is an arithmetic number, because the mean of its divisors is an integer number (34458759).

Almost surely, 2^68917517 is an apocalyptic number.

It is an amenable number.

68917517 is a deficient number, since it is larger than the sum of its proper divisors (1).

68917517 is an equidigital number, since it uses as much as digits as its factorization.

68917517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 44.

The square root of 68917517 is about 8301.6574851050. The cubic root of 68917517 is about 409.9930932804.

The spelling of 68917517 in words is "sixty-eight million, nine hundred seventeen thousand, five hundred seventeen".