136378421 has 2 divisors, whose sum is σ = 136378422. Its totient is φ = 136378420.

The previous prime is 136378391. The next prime is 136378439. The reversal of 136378421 is 124873631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84897796 + 51480625 = 9214^2 + 7175^2 .

It is a cyclic number.

It is not a de Polignac number, because 136378421 - 2⁶ = 136378357 is a prime.

It is a Sophie Germain 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 (136371421) 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, 68189210 + 68189211.

It is an arithmetic number, because the mean of its divisors is an integer number (68189211).

Almost surely, 2^136378421 is an apocalyptic number.

It is an amenable number.

136378421 is a deficient number, since it is larger than the sum of its proper divisors (1).

136378421 is an equidigital number, since it uses as much as digits as its factorization.

136378421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 35.

The square root of 136378421 is about 11678.1171855741. The cubic root of 136378421 is about 514.7328504152.

The spelling of 136378421 in words is "one hundred thirty-six million, three hundred seventy-eight thousand, four hundred twenty-one".