136683821 has 2 divisors, whose sum is σ = 136683822. Its totient is φ = 136683820.

The previous prime is 136683817. The next prime is 136683847. The reversal of 136683821 is 128386631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131905225 + 4778596 = 11485^2 + 2186^2 .

It is a cyclic number.

It is not a de Polignac number, because 136683821 - 2² = 136683817 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136683851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68341910 + 68341911.

It is an arithmetic number, because the mean of its divisors is an integer number (68341911).

Almost surely, 2^136683821 is an apocalyptic number.

It is an amenable number.

136683821 is a deficient number, since it is larger than the sum of its proper divisors (1).

136683821 is an equidigital number, since it uses as much as digits as its factorization.

136683821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 38.

The square root of 136683821 is about 11691.1856113912. The cubic root of 136683821 is about 515.1167875397.

The spelling of 136683821 in words is "one hundred thirty-six million, six hundred eighty-three thousand, eight hundred twenty-one".