136639879 has 2 divisors, whose sum is σ = 136639880. Its totient is φ = 136639878.

The previous prime is 136639861. The next prime is 136639891. The reversal of 136639879 is 978936631.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 136639879 - 2¹⁷ = 136508807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136639819) 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, 68319939 + 68319940.

It is an arithmetic number, because the mean of its divisors is an integer number (68319940).

Almost surely, 2^136639879 is an apocalyptic number.

136639879 is a deficient number, since it is larger than the sum of its proper divisors (1).

136639879 is an equidigital number, since it uses as much as digits as its factorization.

136639879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 52.

The square root of 136639879 is about 11689.3061812924. The cubic root of 136639879 is about 515.0615805962.

The spelling of 136639879 in words is "one hundred thirty-six million, six hundred thirty-nine thousand, eight hundred seventy-nine".