68771917 has 2 divisors, whose sum is σ = 68771918. Its totient is φ = 68771916.

The previous prime is 68771903. The next prime is 68771929. The reversal of 68771917 is 71917786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62315236 + 6456681 = 7894^2 + 2541^2 .

It is a cyclic number.

It is not a de Polignac number, because 68771917 - 2¹⁵ = 68739149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68781917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34385958 + 34385959.

It is an arithmetic number, because the mean of its divisors is an integer number (34385959).

Almost surely, 2^68771917 is an apocalyptic number.

It is an amenable number.

68771917 is a deficient number, since it is larger than the sum of its proper divisors (1).

68771917 is an equidigital number, since it uses as much as digits as its factorization.

68771917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 148176, while the sum is 46.

The square root of 68771917 is about 8292.8835154004. The cubic root of 68771917 is about 409.7041629523.

The spelling of 68771917 in words is "sixty-eight million, seven hundred seventy-one thousand, nine hundred seventeen".