136671439 has 2 divisors, whose sum is σ = 136671440. Its totient is φ = 136671438.

The previous prime is 136671413. The next prime is 136671443. The reversal of 136671439 is 934176631.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 136671439 - 2⁵ = 136671407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136671499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68335719 + 68335720.

It is an arithmetic number, because the mean of its divisors is an integer number (68335720).

Almost surely, 2^136671439 is an apocalyptic number.

136671439 is a deficient number, since it is larger than the sum of its proper divisors (1).

136671439 is an equidigital number, since it uses as much as digits as its factorization.

136671439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 40.

The square root of 136671439 is about 11690.6560551579. The cubic root of 136671439 is about 515.1012324954.

The spelling of 136671439 in words is "one hundred thirty-six million, six hundred seventy-one thousand, four hundred thirty-nine".