68142881 has 2 divisors, whose sum is σ = 68142882. Its totient is φ = 68142880.

The previous prime is 68142857. The next prime is 68142883. The reversal of 68142881 is 18824186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54893281 + 13249600 = 7409^2 + 3640^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68142881 is a prime.

It is a super-2 number, since 2×68142881² = 9286904461960322, which contains 22 as substring.

Together with 68142883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68142883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34071440 + 34071441.

It is an arithmetic number, because the mean of its divisors is an integer number (34071441).

Almost surely, 2^68142881 is an apocalyptic number.

It is an amenable number.

68142881 is a deficient number, since it is larger than the sum of its proper divisors (1).

68142881 is an equidigital number, since it uses as much as digits as its factorization.

68142881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24576, while the sum is 38.

The square root of 68142881 is about 8254.8701382881. The cubic root of 68142881 is about 408.4511881199.

The spelling of 68142881 in words is "sixty-eight million, one hundred forty-two thousand, eight hundred eighty-one".