55481 has 4 divisors (see below), whose sum is σ = 56100. Its totient is φ = 54864.

The previous prime is 55469. The next prime is 55487. The reversal of 55481 is 18455.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18455 = 5 ⋅3691.

It can be written as a sum of positive squares in 2 ways, for example, as 42025 + 13456 = 205^2 + 116^2 .

It is a cyclic number.

It is not a de Polignac number, because 55481 - 2¹⁴ = 39097 is a prime.

It is a super-2 number, since 2×55481² = 6156282722, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (55487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146 + ... + 363.

It is an arithmetic number, because the mean of its divisors is an integer number (14025).

2⁵⁵⁴⁸¹ is an apocalyptic number.

It is an amenable number.

55481 is a deficient number, since it is larger than the sum of its proper divisors (619).

55481 is a wasteful number, since it uses less digits than its factorization.

55481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618.

The product of its digits is 800, while the sum is 23.

The square root of 55481 is about 235.5440510817. The cubic root of 55481 is about 38.1400648160.

The spelling of 55481 in words is "fifty-five thousand, four hundred eighty-one".