51299 has 4 divisors (see below), whose sum is σ = 52536. Its totient is φ = 50064.

The previous prime is 51287. The next prime is 51307. The reversal of 51299 is 99215.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99215 = 5 ⋅19843.

It is a cyclic number.

It is not a de Polignac number, because 51299 - 2⁴ = 51283 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (51229) 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, 554 + ... + 639.

It is an arithmetic number, because the mean of its divisors is an integer number (13134).

2⁵¹²⁹⁹ is an apocalyptic number.

51299 is a deficient number, since it is larger than the sum of its proper divisors (1237).

51299 is a wasteful number, since it uses less digits than its factorization.

51299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236.

The product of its digits is 810, while the sum is 26.

The square root of 51299 is about 226.4928254934. The cubic root of 51299 is about 37.1566284522.

The spelling of 51299 in words is "fifty-one thousand, two hundred ninety-nine".