136515809 has 2 divisors, whose sum is σ = 136515810. Its totient is φ = 136515808.

The previous prime is 136515781. The next prime is 136515859. The reversal of 136515809 is 908515631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114425809 + 22090000 = 10697^2 + 4700^2 .

It is an emirp because it is prime and its reverse (908515631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136515809 - 2⁸ = 136515553 is a prime.

It is a super-2 number, since 2×136515809² = 37273132213848962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (136515859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68257904 + 68257905.

It is an arithmetic number, because the mean of its divisors is an integer number (68257905).

Almost surely, 2^136515809 is an apocalyptic number.

It is an amenable number.

136515809 is a deficient number, since it is larger than the sum of its proper divisors (1).

136515809 is an equidigital number, since it uses as much as digits as its factorization.

136515809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 136515809 is about 11683.9979887023. The cubic root of 136515809 is about 514.9056401728.

The spelling of 136515809 in words is "one hundred thirty-six million, five hundred fifteen thousand, eight hundred nine".