68111881 has 2 divisors, whose sum is σ = 68111882. Its totient is φ = 68111880.

The previous prime is 68111873. The next prime is 68111891. The reversal of 68111881 is 18811186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46172025 + 21939856 = 6795^2 + 4684^2 .

It is a cyclic number.

It is not a de Polignac number, because 68111881 - 2³ = 68111873 is a prime.

It is a super-2 number, since 2×68111881² = 9278456666716322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68111801) 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, 34055940 + 34055941.

It is an arithmetic number, because the mean of its divisors is an integer number (34055941).

Almost surely, 2^68111881 is an apocalyptic number.

It is an amenable number.

68111881 is a deficient number, since it is larger than the sum of its proper divisors (1).

68111881 is an equidigital number, since it uses as much as digits as its factorization.

68111881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3072, while the sum is 34.

The square root of 68111881 is about 8252.9922452405. The cubic root of 68111881 is about 408.3892403066.

The spelling of 68111881 in words is "sixty-eight million, one hundred eleven thousand, eight hundred eighty-one".