136639217 has 16 divisors (see below), whose sum is σ = 169972992. Its totient is φ = 107915520.

The previous prime is 136639177. The next prime is 136639277. The reversal of 136639217 is 712936631.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 136639217 - 2²⁰ = 135590641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136639277) 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 in 15 ways as a sum of consecutive naturals, for example, 25673 + ... + 30534.

It is an arithmetic number, because the mean of its divisors is an integer number (10623312).

Almost surely, 2^136639217 is an apocalyptic number.

136639217 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

136639217 is a deficient number, since it is larger than the sum of its proper divisors (33333775).

136639217 is a wasteful number, since it uses less digits than its factorization.

136639217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56248.

The product of its digits is 40824, while the sum is 38.

The square root of 136639217 is about 11689.2778647785. The cubic root of 136639217 is about 515.0607487958.

The spelling of 136639217 in words is "one hundred thirty-six million, six hundred thirty-nine thousand, two hundred seventeen".