51215 has 4 divisors (see below), whose sum is σ = 61464. Its totient is φ = 40968.

The previous prime is 51203. The next prime is 51217.

51215 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51215 - 2⁴ = 51199 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 51215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51217) 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, 5117 + ... + 5126.

It is an arithmetic number, because the mean of its divisors is an integer number (15366).

2⁵¹²¹⁵ is an apocalyptic number.

51215 is a deficient number, since it is larger than the sum of its proper divisors (10249).

51215 is a wasteful number, since it uses less digits than its factorization.

51215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10248.

The product of its digits is 50, while the sum is 14.

The square root of 51215 is about 226.3073131828. The cubic root of 51215 is about 37.1363365561.

The spelling of 51215 in words is "fifty-one thousand, two hundred fifteen".