51211 has 4 divisors (see below), whose sum is σ = 51912. Its totient is φ = 50512.

The previous prime is 51203. The next prime is 51217. The reversal of 51211 is 11215.

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: 11215 = 5 ⋅2243.

It is a cyclic number.

It is not a de Polignac number, because 51211 - 2³ = 51203 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a nialpdrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (51217) 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, 226 + ... + 391.

It is an arithmetic number, because the mean of its divisors is an integer number (12978).

2⁵¹²¹¹ is an apocalyptic number.

51211 is a deficient number, since it is larger than the sum of its proper divisors (701).

51211 is an equidigital number, since it uses as much as digits as its factorization.

51211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700.

The product of its digits is 10, while the sum is 10.

The square root of 51211 is about 226.2984754699. The cubic root of 51211 is about 37.1353697221.

Adding to 51211 its reverse (11215), we get a palindrome (62426).

It can be divided in two parts, 51 and 211, that added together give a palindrome (262).

The spelling of 51211 in words is "fifty-one thousand, two hundred eleven".