51451 has 4 divisors (see below), whose sum is σ = 53712.
Its totient is φ = 49192.
The previous prime is 51449. The next prime is 51461. The reversal of 51451 is 15415.
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: 15415 = 5 ⋅3083.
It is a cyclic number.
It is not a de Polignac number, because 51451 - 21 = 51449 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (51421) 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, 1096 + ... + 1141.
It is an arithmetic number, because the mean of its divisors is an integer number (13428).
251451 is an apocalyptic number.
51451 is a deficient number, since it is larger than the sum of its proper divisors (2261).
51451 is a wasteful number, since it uses less digits than its factorization.
51451 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2260.
The product of its digits is 100, while the sum is 16.
The square root of 51451 is about 226.8281287671.
The cubic root of 51451 is about 37.1932908855.
Adding to 51451 its reverse (15415), we get a palindrome (66866).
It can be divided in two parts, 514 and 51, that added together give a palindrome (565).
The spelling of 51451 in words is "fifty-one thousand, four hundred fifty-one".