55261 has 4 divisors (see below), whose sum is σ = 56092. Its totient is φ = 54432.

The previous prime is 55259. The next prime is 55291. The reversal of 55261 is 16255.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16255 = 5 ⋅3251.

It can be written as a sum of positive squares in 2 ways, for example, as 32761 + 22500 = 181^2 + 150^2 .

It is a cyclic number.

It is not a de Polignac number, because 55261 - 2¹ = 55259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55201) 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, 306 + ... + 451.

It is an arithmetic number, because the mean of its divisors is an integer number (14023).

2⁵⁵²⁶¹ is an apocalyptic number.

It is an amenable number.

55261 is a deficient number, since it is larger than the sum of its proper divisors (831).

55261 is an equidigital number, since it uses as much as digits as its factorization.

55261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830.

The product of its digits is 300, while the sum is 19.

The square root of 55261 is about 235.0765832660. The cubic root of 55261 is about 38.0895854956.

The spelling of 55261 in words is "fifty-five thousand, two hundred sixty-one".