136186861 has 2 divisors, whose sum is σ = 136186862. Its totient is φ = 136186860.

The previous prime is 136186819. The next prime is 136186867. The reversal of 136186861 is 168681631.

136186861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134792100 + 1394761 = 11610^2 + 1181^2 .

It is a cyclic number.

It is not a de Polignac number, because 136186861 - 2¹⁵ = 136154093 is a prime.

It is a super-2 number, since 2×136186861² = 37093722218066642, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136186867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68093430 + 68093431.

It is an arithmetic number, because the mean of its divisors is an integer number (68093431).

Almost surely, 2^136186861 is an apocalyptic number.

It is an amenable number.

136186861 is a deficient number, since it is larger than the sum of its proper divisors (1).

136186861 is an equidigital number, since it uses as much as digits as its factorization.

136186861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 40.

The square root of 136186861 is about 11669.9126389189. The cubic root of 136186861 is about 514.4917359573.

The spelling of 136186861 in words is "one hundred thirty-six million, one hundred eighty-six thousand, eight hundred sixty-one".