136664491 has 2 divisors, whose sum is σ = 136664492. Its totient is φ = 136664490.

The previous prime is 136664453. The next prime is 136664503. The reversal of 136664491 is 194466631.

It is a strong prime.

It is an emirp because it is prime and its reverse (194466631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136664491 - 2¹⁹ = 136140203 is a prime.

It is not a weakly prime, because it can be changed into another prime (136664401) 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, 68332245 + 68332246.

It is an arithmetic number, because the mean of its divisors is an integer number (68332246).

Almost surely, 2^136664491 is an apocalyptic number.

136664491 is a deficient number, since it is larger than the sum of its proper divisors (1).

136664491 is an equidigital number, since it uses as much as digits as its factorization.

136664491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 40.

The square root of 136664491 is about 11690.3588909836. The cubic root of 136664491 is about 515.0925035709.

The spelling of 136664491 in words is "one hundred thirty-six million, six hundred sixty-four thousand, four hundred ninety-one".