136704391 has 2 divisors, whose sum is σ = 136704392. Its totient is φ = 136704390.

The previous prime is 136704383. The next prime is 136704397. The reversal of 136704391 is 193407631.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 136704391 - 2³ = 136704383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136704397) 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, 68352195 + 68352196.

It is an arithmetic number, because the mean of its divisors is an integer number (68352196).

Almost surely, 2^136704391 is an apocalyptic number.

136704391 is a deficient number, since it is larger than the sum of its proper divisors (1).

136704391 is an equidigital number, since it uses as much as digits as its factorization.

136704391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 136704391 is about 11692.0653008782. The cubic root of 136704391 is about 515.1426267862.

The spelling of 136704391 in words is "one hundred thirty-six million, seven hundred four thousand, three hundred ninety-one".