51447 has 8 divisors (see below), whose sum is σ = 74880. Its totient is φ = 31160.

The previous prime is 51439. The next prime is 51449. The reversal of 51447 is 74415.

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 51447 - 2³ = 51439 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 51447.

It is not an unprimeable number, because it can be changed into a prime (51449) 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, 747 + ... + 812.

It is an arithmetic number, because the mean of its divisors is an integer number (9360).

2⁵¹⁴⁴⁷ is an apocalyptic number.

51447 is a deficient number, since it is larger than the sum of its proper divisors (23433).

51447 is a wasteful number, since it uses less digits than its factorization.

51447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1573.

The product of its digits is 560, while the sum is 21.

The square root of 51447 is about 226.8193113472. The cubic root of 51447 is about 37.1923270104.

It can be divided in two parts, 5144 and 7, that added together give a triangular number (5151 = T₁₀₁).

The spelling of 51447 in words is "fifty-one thousand, four hundred forty-seven".