55771 has 4 divisors (see below), whose sum is σ = 57112. Its totient is φ = 54432.

The previous prime is 55763. The next prime is 55787. The reversal of 55771 is 17755.

55771 is nontrivially palindromic in base 6.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55771 - 2³ = 55763 is a prime.

It is a super-2 number, since 2×55771² = 6220808882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 606 + ... + 691.

It is an arithmetic number, because the mean of its divisors is an integer number (14278).

2⁵⁵⁷⁷¹ is an apocalyptic number.

55771 is a deficient number, since it is larger than the sum of its proper divisors (1341).

55771 is a wasteful number, since it uses less digits than its factorization.

55771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340.

The product of its digits is 1225, while the sum is 25.

The square root of 55771 is about 236.1588448481. The cubic root of 55771 is about 38.2064022602.

It can be divided in two parts, 5 and 5771, that added together give a square (5776 = 76²).

The spelling of 55771 in words is "fifty-five thousand, seven hundred seventy-one".