55439 has 2 divisors, whose sum is σ = 55440. Its totient is φ = 55438.

The previous prime is 55411. The next prime is 55441. The reversal of 55439 is 93455.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55439 - 2¹² = 51343 is a prime.

It is a Sophie Germain prime.

Together with 55441, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27719 + 27720.

It is an arithmetic number, because the mean of its divisors is an integer number (27720).

2⁵⁵⁴³⁹ is an apocalyptic number.

55439 is a deficient number, since it is larger than the sum of its proper divisors (1).

55439 is an equidigital number, since it uses as much as digits as its factorization.

55439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2700, while the sum is 26.

The square root of 55439 is about 235.4548789046. The cubic root of 55439 is about 38.1304381744.

It can be divided in two parts, 55 and 439, that added together give a palindrome (494).

The spelling of 55439 in words is "fifty-five thousand, four hundred thirty-nine".