136131305 has 4 divisors (see below), whose sum is σ = 163357572. Its totient is φ = 108905040.

The previous prime is 136131277. The next prime is 136131313. The reversal of 136131305 is 503131631.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 503131631 = 71 ⋅7086361.

It can be written as a sum of positive squares in 2 ways, for example, as 30514576 + 105616729 = 5524^2 + 10277^2 .

It is not a de Polignac number, because 136131305 - 2⁶ = 136131241 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 13613126 + ... + 13613135.

It is an arithmetic number, because the mean of its divisors is an integer number (40839393).

Almost surely, 2^136131305 is an apocalyptic number.

It is an amenable number.

136131305 is a deficient number, since it is larger than the sum of its proper divisors (27226267).

136131305 is an equidigital number, since it uses as much as digits as its factorization.

136131305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27226266.

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 136131305 is about 11667.5320869497. The cubic root of 136131305 is about 514.4217659414.

Adding to 136131305 its reverse (503131631), we get a palindrome (639262936).

The spelling of 136131305 in words is "one hundred thirty-six million, one hundred thirty-one thousand, three hundred five".