51115 has 4 divisors (see below), whose sum is σ = 61344. Its totient is φ = 40888.

The previous prime is 51109. The next prime is 51131.

51115 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 51115 - 2¹³ = 42923 is a prime.

It is a super-2 number, since 2×51115² = 5225486450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51095 and 51104.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5107 + ... + 5116.

It is an arithmetic number, because the mean of its divisors is an integer number (15336).

2⁵¹¹¹⁵ is an apocalyptic number.

51115 is a deficient number, since it is larger than the sum of its proper divisors (10229).

51115 is a wasteful number, since it uses less digits than its factorization.

51115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10228.

The product of its digits is 25, while the sum is 13.

The square root of 51115 is about 226.0862667214. The cubic root of 51115 is about 37.1121505865.

The spelling of 51115 in words is "fifty-one thousand, one hundred fifteen".