135531444 has 48 divisors (see below), whose sum is σ = 326043648. Its totient is φ = 43786368.

The previous prime is 135531439. The next prime is 135531449. The reversal of 135531444 is 444135531.

It is an interprime number because it is at equal distance from previous prime (135531439) and next prime (135531449).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135531449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169654 + ... + 170450.

It is an arithmetic number, because the mean of its divisors is an integer number (6792576).

Almost surely, 2^135531444 is an apocalyptic number.

It is an amenable number.

135531444 is an abundant number, since it is smaller than the sum of its proper divisors (190512204).

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

135531444 is a wasteful number, since it uses less digits than its factorization.

135531444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224 (or 1222 counting only the distinct ones).

The product of its digits is 14400, while the sum is 30.

The square root of 135531444 is about 11641.7972839248. The cubic root of 135531444 is about 513.6650555446.

Adding to 135531444 its reverse (444135531), we get a palindrome (579666975).

The spelling of 135531444 in words is "one hundred thirty-five million, five hundred thirty-one thousand, four hundred forty-four".