68239081 has 2 divisors, whose sum is σ = 68239082. Its totient is φ = 68239080.

The previous prime is 68239069. The next prime is 68239097. The reversal of 68239081 is 18093286.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52707600 + 15531481 = 7260^2 + 3941^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68239081 is a prime.

It is a super-2 number, since 2×68239081² = 9313144351449122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 68239081.

It is not a weakly prime, because it can be changed into another prime (68239181) 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, 34119540 + 34119541.

It is an arithmetic number, because the mean of its divisors is an integer number (34119541).

Almost surely, 2^68239081 is an apocalyptic number.

It is an amenable number.

68239081 is a deficient number, since it is larger than the sum of its proper divisors (1).

68239081 is an equidigital number, since it uses as much as digits as its factorization.

68239081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 68239081 is about 8260.6949465526. The cubic root of 68239081 is about 408.6433066397.

The spelling of 68239081 in words is "sixty-eight million, two hundred thirty-nine thousand, eighty-one".