68968981 has 2 divisors, whose sum is σ = 68968982. Its totient is φ = 68968980.

The previous prime is 68968969. The next prime is 68968997. The reversal of 68968981 is 18986986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68392900 + 576081 = 8270^2 + 759^2 .

It is a cyclic number.

It is not a de Polignac number, because 68968981 - 2⁷ = 68968853 is a prime.

It is a super-2 number, since 2×68968981² = 9513440680356722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68968181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34484490 + 34484491.

It is an arithmetic number, because the mean of its divisors is an integer number (34484491).

Almost surely, 2^68968981 is an apocalyptic number.

It is an amenable number.

68968981 is a deficient number, since it is larger than the sum of its proper divisors (1).

68968981 is an equidigital number, since it uses as much as digits as its factorization.

68968981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1492992, while the sum is 55.

The square root of 68968981 is about 8304.7565286407. The cubic root of 68968981 is about 410.0951216933.

The spelling of 68968981 in words is "sixty-eight million, nine hundred sixty-eight thousand, nine hundred eighty-one".