55391 has 8 divisors (see below), whose sum is σ = 65184. Its totient is φ = 46080.

The previous prime is 55381. The next prime is 55399. The reversal of 55391 is 19355.

55391 = 41² + 42² + ... + 61².

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

It is a cyclic number.

It is not a de Polignac number, because 55391 - 2¹⁰ = 54367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55399) 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, 191 + ... + 383.

It is an arithmetic number, because the mean of its divisors is an integer number (8148).

2⁵⁵³⁹¹ is an apocalyptic number.

55391 is a deficient number, since it is larger than the sum of its proper divisors (9793).

55391 is a wasteful number, since it uses less digits than its factorization.

55391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241.

The product of its digits is 675, while the sum is 23.

The square root of 55391 is about 235.3529264743. The cubic root of 55391 is about 38.1194303429.

The spelling of 55391 in words is "fifty-five thousand, three hundred ninety-one".