51730219 has 2 divisors, whose sum is σ = 51730220. Its totient is φ = 51730218.

The previous prime is 51730213. The next prime is 51730253. The reversal of 51730219 is 91203715.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51730219 is a prime.

It is a super-2 number, since 2×51730219² = 5352031115575922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51730213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25865109 + 25865110.

It is an arithmetic number, because the mean of its divisors is an integer number (25865110).

Almost surely, 2^51730219 is an apocalyptic number.

51730219 is a deficient number, since it is larger than the sum of its proper divisors (1).

51730219 is an equidigital number, since it uses as much as digits as its factorization.

51730219 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 51730219 is about 7192.3722790189. The cubic root of 51730219 is about 372.6045086100.

The spelling of 51730219 in words is "fifty-one million, seven hundred thirty thousand, two hundred nineteen".