54987 has 4 divisors (see below), whose sum is σ = 73320. Its totient is φ = 36656.

The previous prime is 54983. The next prime is 55001. The reversal of 54987 is 78945.

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 54987 - 2² = 54983 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between odd and even.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (54983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9162 + ... + 9167.

It is an arithmetic number, because the mean of its divisors is an integer number (18330).

2⁵⁴⁹⁸⁷ is an apocalyptic number.

54987 is a deficient number, since it is larger than the sum of its proper divisors (18333).

54987 is a wasteful number, since it uses less digits than its factorization.

54987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18332.

The product of its digits is 10080, while the sum is 33.

The square root of 54987 is about 234.4930702601. The cubic root of 54987 is about 38.0265281059.

It can be divided in two parts, 549 and 87, that added together give a palindrome (636).

The spelling of 54987 in words is "fifty-four thousand, nine hundred eighty-seven".