68774581 has 2 divisors, whose sum is σ = 68774582. Its totient is φ = 68774580.

The previous prime is 68774579. The next prime is 68774591. The reversal of 68774581 is 18547786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63345681 + 5428900 = 7959^2 + 2330^2 .

It is a cyclic number.

It is not a de Polignac number, because 68774581 - 2¹ = 68774579 is a prime.

It is a super-2 number, since 2×68774581² = 9459885983451122, which contains 22 as substring.

Together with 68774579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68774521) 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, 34387290 + 34387291.

It is an arithmetic number, because the mean of its divisors is an integer number (34387291).

Almost surely, 2^68774581 is an apocalyptic number.

It is an amenable number.

68774581 is a deficient number, since it is larger than the sum of its proper divisors (1).

68774581 is an equidigital number, since it uses as much as digits as its factorization.

68774581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 376320, while the sum is 46.

The square root of 68774581 is about 8293.0441334892. The cubic root of 68774581 is about 409.7094530854.

The spelling of 68774581 in words is "sixty-eight million, seven hundred seventy-four thousand, five hundred eighty-one".