51619 has 4 divisors (see below), whose sum is σ = 52920. Its totient is φ = 50320.

The previous prime is 51613. The next prime is 51631. The reversal of 51619 is 91615.

51619 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51619 - 2¹³ = 43427 is a prime.

It is a super-2 number, since 2×51619² = 5329042322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51619.

It is not an unprimeable number, because it can be changed into a prime (51613) 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, 589 + ... + 670.

It is an arithmetic number, because the mean of its divisors is an integer number (13230).

2⁵¹⁶¹⁹ is an apocalyptic number.

51619 is a deficient number, since it is larger than the sum of its proper divisors (1301).

51619 is a wasteful number, since it uses less digits than its factorization.

51619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300.

The product of its digits is 270, while the sum is 22.

The square root of 51619 is about 227.1981514009. The cubic root of 51619 is about 37.2337286110.

It can be divided in two parts, 516 and 19, that added together give a palindrome (535).

The spelling of 51619 in words is "fifty-one thousand, six hundred nineteen".