135481 has 4 divisors (see below), whose sum is σ = 137764. Its totient is φ = 133200.

The previous prime is 135479. The next prime is 135497. The reversal of 135481 is 184531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 184531 = 127 ⋅1453.

It can be written as a sum of positive squares in 2 ways, for example, as 40000 + 95481 = 200^2 + 309^2 .

It is a cyclic number.

It is not a de Polignac number, because 135481 - 2¹ = 135479 is a prime.

It is a super-2 number, since 2×135481² = 36710202722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1050 + ... + 1171.

It is an arithmetic number, because the mean of its divisors is an integer number (34441).

2¹³⁵⁴⁸¹ is an apocalyptic number.

It is an amenable number.

135481 is a deficient number, since it is larger than the sum of its proper divisors (2283).

135481 is an equidigital number, since it uses as much as digits as its factorization.

135481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2282.

The product of its digits is 480, while the sum is 22.

The square root of 135481 is about 368.0774375047. The cubic root of 135481 is about 51.3601319940.

It can be divided in two parts, 135 and 481, that added together give a palindrome (616).

The spelling of 135481 in words is "one hundred thirty-five thousand, four hundred eighty-one".