136531444 has 36 divisors (see below), whose sum is σ = 280678944. Its totient is φ = 57936816.

The previous prime is 136531433. The next prime is 136531469. The reversal of 136531444 is 444135631.

It is a happy number.

It is a congruent 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 11 ways as a sum of consecutive naturals, for example, 16807 + ... + 23569.

Almost surely, 2^136531444 is an apocalyptic number.

136531444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 136531444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140339472).

136531444 is an abundant number, since it is smaller than the sum of its proper divisors (144147500).

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

136531444 is a wasteful number, since it uses less digits than its factorization.

136531444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6884 (or 6875 counting only the distinct ones).

The product of its digits is 17280, while the sum is 31.

The square root of 136531444 is about 11684.6670470322. The cubic root of 136531444 is about 514.9252966078.

The spelling of 136531444 in words is "one hundred thirty-six million, five hundred thirty-one thousand, four hundred forty-four".