136243621 has 2 divisors, whose sum is σ = 136243622. Its totient is φ = 136243620.

The previous prime is 136243619. The next prime is 136243631. The reversal of 136243621 is 126342631.

136243621 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., 136072225 + 171396 = 11665^2 + 414^2 .

It is a cyclic number.

It is not a de Polignac number, because 136243621 - 2¹ = 136243619 is a prime.

Together with 136243619, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 136243621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136243631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68121810 + 68121811.

It is an arithmetic number, because the mean of its divisors is an integer number (68121811).

Almost surely, 2^136243621 is an apocalyptic number.

It is an amenable number.

136243621 is a deficient number, since it is larger than the sum of its proper divisors (1).

136243621 is an equidigital number, since it uses as much as digits as its factorization.

136243621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 28.

The square root of 136243621 is about 11672.3442803920. The cubic root of 136243621 is about 514.5632027020.

The spelling of 136243621 in words is "one hundred thirty-six million, two hundred forty-three thousand, six hundred twenty-one".