136621 has 2 divisors, whose sum is σ = 136622. Its totient is φ = 136620.

The previous prime is 136607. The next prime is 136649. The reversal of 136621 is 126631.

136621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98596 + 38025 = 314^2 + 195^2 .

It is an emirp because it is prime and its reverse (126631) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136621 is a prime.

It is a Chen prime.

136621 is a lucky number.

It is equal to p₁₂₇₂₇ and since 136621 and 12727 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68310 + 68311.

It is an arithmetic number, because the mean of its divisors is an integer number (68311).

2¹³⁶⁶²¹ is an apocalyptic number.

It is an amenable number.

136621 is a deficient number, since it is larger than the sum of its proper divisors (1).

136621 is an equidigital number, since it uses as much as digits as its factorization.

136621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 19.

The square root of 136621 is about 369.6227806832. The cubic root of 136621 is about 51.5037858153.

It can be divided in two parts, 136 and 621, that added together give a palindrome (757).

The spelling of 136621 in words is "one hundred thirty-six thousand, six hundred twenty-one".