136821144 has 32 divisors (see below), whose sum is σ = 342342000. Its totient is φ = 45568512.

The previous prime is 136821137. The next prime is 136821149. The reversal of 136821144 is 441128631.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136821149) 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 7 ways as a sum of consecutive naturals, for example, 48772 + ... + 51500.

Almost surely, 2^136821144 is an apocalyptic number.

It is an amenable number.

136821144 is an abundant number, since it is smaller than the sum of its proper divisors (205520856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

136821144 is a wasteful number, since it uses less digits than its factorization.

136821144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4827 (or 4823 counting only the distinct ones).

The product of its digits is 4608, while the sum is 30.

The square root of 136821144 is about 11697.0570657751. The cubic root of 136821144 is about 515.2892383485.

Adding to 136821144 its reverse (441128631), we get a palindrome (577949775).

The spelling of 136821144 in words is "one hundred thirty-six million, eight hundred twenty-one thousand, one hundred forty-four".