55513 has 4 divisors (see below), whose sum is σ = 56848. Its totient is φ = 54180.

The previous prime is 55511. The next prime is 55529. The reversal of 55513 is 31555.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31555 = 5 ⋅6311.

It is not a de Polignac number, because 55513 - 2¹ = 55511 is a prime.

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 (55511) 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, 603 + ... + 688.

It is an arithmetic number, because the mean of its divisors is an integer number (14212).

2⁵⁵⁵¹³ is an apocalyptic number.

It is an amenable number.

55513 is a deficient number, since it is larger than the sum of its proper divisors (1335).

55513 is a wasteful number, since it uses less digits than its factorization.

55513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334.

The product of its digits is 375, while the sum is 19.

The square root of 55513 is about 235.6119691357. The cubic root of 55513 is about 38.1473961396.

It can be divided in two parts, 5551 and 3, that multiplied together give a triangular number (16653 = T₁₈₂).

The spelling of 55513 in words is "fifty-five thousand, five hundred thirteen".