68138641 has 2 divisors, whose sum is σ = 68138642. Its totient is φ = 68138640.

The previous prime is 68138633. The next prime is 68138657. The reversal of 68138641 is 14683186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59228416 + 8910225 = 7696^2 + 2985^2 .

It is a cyclic number.

It is not a de Polignac number, because 68138641 - 2³ = 68138633 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68138641.

It is not a weakly prime, because it can be changed into another prime (68138671) 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 as a sum of consecutive naturals, namely, 34069320 + 34069321.

It is an arithmetic number, because the mean of its divisors is an integer number (34069321).

Almost surely, 2^68138641 is an apocalyptic number.

It is an amenable number.

68138641 is a deficient number, since it is larger than the sum of its proper divisors (1).

68138641 is an equidigital number, since it uses as much as digits as its factorization.

68138641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 37.

The square root of 68138641 is about 8254.6133162008. The cubic root of 68138641 is about 408.4427163670.

The spelling of 68138641 in words is "sixty-eight million, one hundred thirty-eight thousand, six hundred forty-one".