136513217 has 4 divisors (see below), whose sum is σ = 136536660. Its totient is φ = 136489776.

The previous prime is 136513199. The next prime is 136513229. The reversal of 136513217 is 712315631.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 20757136 + 115756081 = 4556^2 + 10759^2 .

It is a cyclic number.

It is not a de Polignac number, because 136513217 - 2²² = 132318913 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 136513217.

It is not an unprimeable number, because it can be changed into a prime (136513297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4463 + ... + 17115.

It is an arithmetic number, because the mean of its divisors is an integer number (34134165).

Almost surely, 2^136513217 is an apocalyptic number.

It is an amenable number.

136513217 is a deficient number, since it is larger than the sum of its proper divisors (23443).

136513217 is a wasteful number, since it uses less digits than its factorization.

136513217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23442.

The product of its digits is 3780, while the sum is 29.

The square root of 136513217 is about 11683.8870672392. The cubic root of 136513217 is about 514.9023813467.

Adding to 136513217 its reverse (712315631), we get a palindrome (848828848).

The spelling of 136513217 in words is "one hundred thirty-six million, five hundred thirteen thousand, two hundred seventeen".