136066981 has 2 divisors, whose sum is σ = 136066982. Its totient is φ = 136066980.

The previous prime is 136066951. The next prime is 136067023. The reversal of 136066981 is 189660631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127012900 + 9054081 = 11270^2 + 3009^2 .

It is a cyclic number.

It is not a de Polignac number, because 136066981 - 2¹¹ = 136064933 is a prime.

It is a super-2 number, since 2×136066981² = 37028446636908722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136066901) 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, 68033490 + 68033491.

It is an arithmetic number, because the mean of its divisors is an integer number (68033491).

Almost surely, 2^136066981 is an apocalyptic number.

It is an amenable number.

136066981 is a deficient number, since it is larger than the sum of its proper divisors (1).

136066981 is an equidigital number, since it uses as much as digits as its factorization.

136066981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 136066981 is about 11664.7752228665. The cubic root of 136066981 is about 514.3407292815.

The spelling of 136066981 in words is "one hundred thirty-six million, sixty-six thousand, nine hundred eighty-one".