68940517 has 2 divisors, whose sum is σ = 68940518. Its totient is φ = 68940516.

The previous prime is 68940467. The next prime is 68940523. The reversal of 68940517 is 71504986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57744801 + 11195716 = 7599^2 + 3346^2 .

It is a cyclic number.

It is not a de Polignac number, because 68940517 - 2¹¹ = 68938469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68940517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68940527) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34470258 + 34470259.

It is an arithmetic number, because the mean of its divisors is an integer number (34470259).

Almost surely, 2^68940517 is an apocalyptic number.

It is an amenable number.

68940517 is a deficient number, since it is larger than the sum of its proper divisors (1).

68940517 is an equidigital number, since it uses as much as digits as its factorization.

68940517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 68940517 is about 8303.0426350826. The cubic root of 68940517 is about 410.0386975174.

The spelling of 68940517 in words is "sixty-eight million, nine hundred forty thousand, five hundred seventeen".