51489 has 8 divisors (see below), whose sum is σ = 76320. Its totient is φ = 34308.

The previous prime is 51487. The next prime is 51503. The reversal of 51489 is 98415.

51489 is nontrivially palindromic in base 8.

It is not a de Polignac number, because 51489 - 2¹ = 51487 is a prime.

It is a super-2 number, since 2×51489² = 5302234242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1907 = 51489 / (5 + 1 + 4 + 8 + 9).

It is a nialpdrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 51489.

It is not an unprimeable number, because it can be changed into a prime (51481) 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, 927 + ... + 980.

It is an arithmetic number, because the mean of its divisors is an integer number (9540).

2⁵¹⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

51489 is a deficient number, since it is larger than the sum of its proper divisors (24831).

51489 is a wasteful number, since it uses less digits than its factorization.

51489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1916 (or 1910 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 51489 is about 226.9118771682. The cubic root of 51489 is about 37.2024452087.

The spelling of 51489 in words is "fifty-one thousand, four hundred eighty-nine".