136549421 has 4 divisors (see below), whose sum is σ = 137035644. Its totient is φ = 136063200.

The previous prime is 136549403. The next prime is 136549463. The reversal of 136549421 is 124945631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124945631 = 17 ⋅7349743.

It can be written as a sum of positive squares in 2 ways, for example, as 117722500 + 18826921 = 10850^2 + 4339^2 .

It is a cyclic number.

It is not a de Polignac number, because 136549421 - 2²² = 132355117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136549471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242690 + ... + 243251.

It is an arithmetic number, because the mean of its divisors is an integer number (34258911).

Almost surely, 2^136549421 is an apocalyptic number.

It is an amenable number.

136549421 is a deficient number, since it is larger than the sum of its proper divisors (486223).

136549421 is an equidigital number, since it uses as much as digits as its factorization.

136549421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486222.

The product of its digits is 25920, while the sum is 35.

The square root of 136549421 is about 11685.4362776920. The cubic root of 136549421 is about 514.9478955675.

The spelling of 136549421 in words is "one hundred thirty-six million, five hundred forty-nine thousand, four hundred twenty-one".