68837581 has 2 divisors, whose sum is σ = 68837582. Its totient is φ = 68837580.

The previous prime is 68837579. The next prime is 68837591. The reversal of 68837581 is 18573886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40386025 + 28451556 = 6355^2 + 5334^2 .

It is a cyclic number.

It is not a de Polignac number, because 68837581 - 2¹ = 68837579 is a prime.

It is a super-2 number, since 2×68837581² = 9477225115863122, which contains 22 as substring.

Together with 68837579, 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 (68837591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34418790 + 34418791.

It is an arithmetic number, because the mean of its divisors is an integer number (34418791).

Almost surely, 2^68837581 is an apocalyptic number.

It is an amenable number.

68837581 is a deficient number, since it is larger than the sum of its proper divisors (1).

68837581 is an equidigital number, since it uses as much as digits as its factorization.

68837581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 46.

The square root of 68837581 is about 8296.8416279931. The cubic root of 68837581 is about 409.8345177905.

The spelling of 68837581 in words is "sixty-eight million, eight hundred thirty-seven thousand, five hundred eighty-one".