55231 has 4 divisors (see below), whose sum is σ = 60264. Its totient is φ = 50200.

The previous prime is 55229. The next prime is 55243. The reversal of 55231 is 13255.

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 55231 - 2¹ = 55229 is a prime.

It is a super-2 number, since 2×55231² = 6100926722, which contains 22 as substring.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2500 + ... + 2521.

It is an arithmetic number, because the mean of its divisors is an integer number (15066).

2⁵⁵²³¹ is an apocalyptic number.

55231 is a deficient number, since it is larger than the sum of its proper divisors (5033).

55231 is a wasteful number, since it uses less digits than its factorization.

55231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5032.

The product of its digits is 150, while the sum is 16.

The square root of 55231 is about 235.0127656107. The cubic root of 55231 is about 38.0826915776.

Adding to 55231 its reverse (13255), we get a palindrome (68486).

The spelling of 55231 in words is "fifty-five thousand, two hundred thirty-one".