51718519 has 2 divisors, whose sum is σ = 51718520. Its totient is φ = 51718518.

The previous prime is 51718517. The next prime is 51718543. The reversal of 51718519 is 91581715.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51718519 - 2¹ = 51718517 is a prime.

It is a super-3 number, since 3×51718519³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 51718517, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51718517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25859259 + 25859260.

It is an arithmetic number, because the mean of its divisors is an integer number (25859260).

Almost surely, 2^51718519 is an apocalyptic number.

51718519 is a deficient number, since it is larger than the sum of its proper divisors (1).

51718519 is an equidigital number, since it uses as much as digits as its factorization.

51718519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 37.

The square root of 51718519 is about 7191.5588713435. The cubic root of 51718519 is about 372.5764154146.

The spelling of 51718519 in words is "fifty-one million, seven hundred eighteen thousand, five hundred nineteen".