68459081 has 2 divisors, whose sum is σ = 68459082. Its totient is φ = 68459080.

The previous prime is 68459009. The next prime is 68459089. The reversal of 68459081 is 18095486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34633225 + 33825856 = 5885^2 + 5816^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68459081 is a prime.

It is a super-2 number, since 2×68459081² = 9373291542729122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68459089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34229540 + 34229541.

It is an arithmetic number, because the mean of its divisors is an integer number (34229541).

Almost surely, 2^68459081 is an apocalyptic number.

It is an amenable number.

68459081 is a deficient number, since it is larger than the sum of its proper divisors (1).

68459081 is an equidigital number, since it uses as much as digits as its factorization.

68459081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 68459081 is about 8274.0003021513. Note that the first 3 decimals coincide. The cubic root of 68459081 is about 409.0819853063.

It can be divided in two parts, 684 and 59081, that multiplied together give a palindrome (40411404).

The spelling of 68459081 in words is "sixty-eight million, four hundred fifty-nine thousand, eighty-one".