51181 has 8 divisors (see below), whose sum is σ = 57344. Its totient is φ = 45360.

The previous prime is 51169. The next prime is 51193. The reversal of 51181 is 18115.

51181 is nontrivially palindromic in base 9.

51181 is an esthetic number in base 3, because in such base its adjacent digits differ by 1.

It is an interprime number because it is at equal distance from previous prime (51169) and next prime (51193).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51181 - 2¹³ = 42989 is a prime.

It is a super-2 number, since 2×51181² = 5238989522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 340 + ... + 466.

It is an arithmetic number, because the mean of its divisors is an integer number (7168).

2⁵¹¹⁸¹ is an apocalyptic number.

It is an amenable number.

51181 is a deficient number, since it is larger than the sum of its proper divisors (6163).

51181 is a wasteful number, since it uses less digits than its factorization.

51181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171.

The product of its digits is 40, while the sum is 16.

The square root of 51181 is about 226.2321816188. The cubic root of 51181 is about 37.1281168617.

Adding to 51181 its reverse (18115), we get a palindrome (69296).

It can be divided in two parts, 51 and 181, that added together give a palindrome (232).

The spelling of 51181 in words is "fifty-one thousand, one hundred eighty-one".