55987 has 2 divisors, whose sum is σ = 55988. Its totient is φ = 55986.

The previous prime is 55967. The next prime is 55997. The reversal of 55987 is 78955.

55987 is nontrivially palindromic in base 6.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55987 - 2¹¹ = 53939 is a prime.

55987 is a nontrivial repdigit in base 6.

It is a plaindrome in base 6.

It is a nialpdrome in base 6.

It is a zygodrome in base 6.

It is not a weakly prime, because it can be changed into another prime (55927) by changing a digit.

It is a nontrivial repunit in base 6.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27993 + 27994.

It is an arithmetic number, because the mean of its divisors is an integer number (27994).

2⁵⁵⁹⁸⁷ is an apocalyptic number.

55987 is a deficient number, since it is larger than the sum of its proper divisors (1).

55987 is an equidigital number, since it uses as much as digits as its factorization.

55987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 34.

The square root of 55987 is about 236.6157222164. The cubic root of 55987 is about 38.2556629376.

It can be divided in two parts, 559 and 87, that added together give a palindrome (646).

The spelling of 55987 in words is "fifty-five thousand, nine hundred eighty-seven".