55145 has 8 divisors (see below), whose sum is σ = 68040. Its totient is φ = 42880.

The previous prime is 55127. The next prime is 55147. The reversal of 55145 is 54155.

55145 = T₃₀ + T₃₁ + ... + T₇₀.

It can be written as a sum of positive squares in 4 ways, for example, as 2704 + 52441 = 52^2 + 229^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55145 - 2¹⁰ = 54121 is a prime.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 55145.

It is not an unprimeable number, because it can be changed into a prime (55147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71 + ... + 339.

It is an arithmetic number, because the mean of its divisors is an integer number (8505).

2⁵⁵¹⁴⁵ is an apocalyptic number.

It is an amenable number.

55145 is a deficient number, since it is larger than the sum of its proper divisors (12895).

55145 is a wasteful number, since it uses less digits than its factorization.

55145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315.

The product of its digits is 500, while the sum is 20.

The square root of 55145 is about 234.8297255460. The cubic root of 55145 is about 38.0629151668.

Subtracting from 55145 its product of digits (500), we obtain a palindrome (54645).

Subtracting from 55145 its reverse (54155), we obtain a triangular number (990 = T₄₄).

The spelling of 55145 in words is "fifty-five thousand, one hundred forty-five".