51919 has 4 divisors (see below), whose sum is σ = 59344.
Its totient is φ = 44496.
The previous prime is 51913. The next prime is 51929. The reversal of 51919 is 91915.
51919 is nontrivially palindromic in base 9.
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 51919 - 29 = 51407 is a prime.
It is a super-2 number, since 2×519192 = 5391165122, which contains 22 as substring.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 51893 and 51902.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (51913) 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, 3702 + ... + 3715.
It is an arithmetic number, because the mean of its divisors is an integer number (14836).
251919 is an apocalyptic number.
51919 is a deficient number, since it is larger than the sum of its proper divisors (7425).
51919 is an equidigital number, since it uses as much as digits as its factorization.
51919 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 7424.
The product of its digits is 405, while the sum is 25.
The square root of 51919 is about 227.8574115538.
The cubic root of 51919 is about 37.3057211502.
The spelling of 51919 in words is "fifty-one thousand, nine hundred nineteen".