51518 has 4 divisors (see below), whose sum is σ = 77280. Its totient is φ = 25758.

The previous prime is 51517. The next prime is 51521. The reversal of 51518 is 81515.

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

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 51518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12878 + ... + 12881.

It is an arithmetic number, because the mean of its divisors is an integer number (19320).

2⁵¹⁵¹⁸ is an apocalyptic number.

51518 is a deficient number, since it is larger than the sum of its proper divisors (25762).

51518 is a wasteful number, since it uses less digits than its factorization.

51518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25761.

The product of its digits is 200, while the sum is 20.

The square root of 51518 is about 226.9757696319. The cubic root of 51518 is about 37.2094283729.

The spelling of 51518 in words is "fifty-one thousand, five hundred eighteen".