68111917 has 4 divisors (see below), whose sum is σ = 68139036. Its totient is φ = 68084800.

The previous prime is 68111899. The next prime is 68111921. The reversal of 68111917 is 71911186.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71911186 = 2 ⋅35955593.

It can be written as a sum of positive squares in 2 ways, for example, as 40717161 + 27394756 = 6381^2 + 5234^2 .

It is a cyclic number.

It is not a de Polignac number, because 68111917 - 2²³ = 59723309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68111987) 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 in 3 ways as a sum of consecutive naturals, for example, 9358 + ... + 14959.

It is an arithmetic number, because the mean of its divisors is an integer number (17034759).

Almost surely, 2^68111917 is an apocalyptic number.

It is an amenable number.

68111917 is a deficient number, since it is larger than the sum of its proper divisors (27119).

68111917 is a wasteful number, since it uses less digits than its factorization.

68111917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27118.

The product of its digits is 3024, while the sum is 34.

The square root of 68111917 is about 8252.9944262674. The cubic root of 68111917 is about 408.3893122569.

The spelling of 68111917 in words is "sixty-eight million, one hundred eleven thousand, nine hundred seventeen".