136585681 has 2 divisors, whose sum is σ = 136585682. Its totient is φ = 136585680.

The previous prime is 136585663. The next prime is 136585693. The reversal of 136585681 is 186585631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94400656 + 42185025 = 9716^2 + 6495^2 .

It is an emirp because it is prime and its reverse (186585631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136585681 - 2¹¹ = 136583633 is a prime.

It is a super-2 number, since 2×136585681² = 37311296508467522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (136585601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68292840 + 68292841.

It is an arithmetic number, because the mean of its divisors is an integer number (68292841).

Almost surely, 2^136585681 is an apocalyptic number.

136585681 is the 7392-nd centered pentagonal number.

It is an amenable number.

136585681 is a deficient number, since it is larger than the sum of its proper divisors (1).

136585681 is an equidigital number, since it uses as much as digits as its factorization.

136585681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 43.

The square root of 136585681 is about 11686.9876786108. The cubic root of 136585681 is about 514.9934721264.

The spelling of 136585681 in words is "one hundred thirty-six million, five hundred eighty-five thousand, six hundred eighty-one".