136828921 has 2 divisors, whose sum is σ = 136828922. Its totient is φ = 136828920.

The previous prime is 136828919. The next prime is 136828933. The reversal of 136828921 is 129828631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131423296 + 5405625 = 11464^2 + 2325^2 .

It is an emirp because it is prime and its reverse (129828631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136828921 - 2¹ = 136828919 is a prime.

Together with 136828919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (136822921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68414460 + 68414461.

It is an arithmetic number, because the mean of its divisors is an integer number (68414461).

Almost surely, 2^136828921 is an apocalyptic number.

It is an amenable number.

136828921 is a deficient number, since it is larger than the sum of its proper divisors (1).

136828921 is an equidigital number, since it uses as much as digits as its factorization.

136828921 is an odious number, because the sum of its binary digits is odd.

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

The square root of 136828921 is about 11697.3894950968. The cubic root of 136828921 is about 515.2990012851.

The spelling of 136828921 in words is "one hundred thirty-six million, eight hundred twenty-eight thousand, nine hundred twenty-one".