51369 has 4 divisors (see below), whose sum is σ = 68496. Its totient is φ = 34244.

The previous prime is 51361. The next prime is 51383. The reversal of 51369 is 96315.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51369 - 2³ = 51361 is a prime.

It is a super-2 number, since 2×51369² = 5277548322, which contains 22 as substring.

It is a D-number.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (51361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8559 + ... + 8564.

It is an arithmetic number, because the mean of its divisors is an integer number (17124).

2⁵¹³⁶⁹ is an apocalyptic number.

It is an amenable number.

51369 is a deficient number, since it is larger than the sum of its proper divisors (17127).

51369 is a wasteful number, since it uses less digits than its factorization.

51369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17126.

The product of its digits is 810, while the sum is 24.

The square root of 51369 is about 226.6473030945. The cubic root of 51369 is about 37.1735214510.

The spelling of 51369 in words is "fifty-one thousand, three hundred sixty-nine".