136011409 has 4 divisors (see below), whose sum is σ = 138577716. Its totient is φ = 133445104.

The previous prime is 136011401. The next prime is 136011427. The reversal of 136011409 is 904110631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 904110631 = 59 ⋅15323909.

It can be written as a sum of positive squares in 2 ways, for example, as 88360000 + 47651409 = 9400^2 + 6903^2 .

It is a cyclic number.

It is not a de Polignac number, because 136011409 - 2³ = 136011401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136011401) 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 3 ways as a sum of consecutive naturals, for example, 1283074 + ... + 1283179.

It is an arithmetic number, because the mean of its divisors is an integer number (34644429).

Almost surely, 2^136011409 is an apocalyptic number.

It is an amenable number.

136011409 is a deficient number, since it is larger than the sum of its proper divisors (2566307).

136011409 is an equidigital number, since it uses as much as digits as its factorization.

136011409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2566306.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 136011409 is about 11662.3929362717. The cubic root of 136011409 is about 514.2706980000.

It can be divided in two parts, 1360 and 11409, that added together give a square (12769 = 113²).

The spelling of 136011409 in words is "one hundred thirty-six million, eleven thousand, four hundred nine".