68824981 has 2 divisors, whose sum is σ = 68824982. Its totient is φ = 68824980.

The previous prime is 68824979. The next prime is 68824997. The reversal of 68824981 is 18942886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68807025 + 17956 = 8295^2 + 134^2 .

It is a cyclic number.

It is not a de Polignac number, because 68824981 - 2¹ = 68824979 is a prime.

It is a super-2 number, since 2×68824981² = 9473756019300722, which contains 22 as substring.

Together with 68824979, 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 (68824961) 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, 34412490 + 34412491.

It is an arithmetic number, because the mean of its divisors is an integer number (34412491).

Almost surely, 2^68824981 is an apocalyptic number.

It is an amenable number.

68824981 is a deficient number, since it is larger than the sum of its proper divisors (1).

68824981 is an equidigital number, since it uses as much as digits as its factorization.

68824981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 221184, while the sum is 46.

The square root of 68824981 is about 8296.0822681553. The cubic root of 68824981 is about 409.8095109559.

The spelling of 68824981 in words is "sixty-eight million, eight hundred twenty-four thousand, nine hundred eighty-one".