68895581 has 2 divisors, whose sum is σ = 68895582. Its totient is φ = 68895580.

The previous prime is 68895571. The next prime is 68895583. The reversal of 68895581 is 18559886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68392900 + 502681 = 8270^2 + 709^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68895581 is a prime.

It is a super-2 number, since 2×68895581² = 9493202162655122, which contains 22 as substring.

Together with 68895583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68895583) 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, 34447790 + 34447791.

It is an arithmetic number, because the mean of its divisors is an integer number (34447791).

Almost surely, 2^68895581 is an apocalyptic number.

It is an amenable number.

68895581 is a deficient number, since it is larger than the sum of its proper divisors (1).

68895581 is an equidigital number, since it uses as much as digits as its factorization.

68895581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 691200, while the sum is 50.

The square root of 68895581 is about 8300.3361980103. The cubic root of 68895581 is about 409.9495892810.

It can be divided in two parts, 688 and 95581, that added together give a palindrome (96269).

The spelling of 68895581 in words is "sixty-eight million, eight hundred ninety-five thousand, five hundred eighty-one".