51689219 has 2 divisors, whose sum is σ = 51689220. Its totient is φ = 51689218.

The previous prime is 51689213. The next prime is 51689249. The reversal of 51689219 is 91298615.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51689219 - 2⁴ = 51689203 is a prime.

It is a super-2 number, since 2×51689219² = 5343550721659922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51689213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25844609 + 25844610.

It is an arithmetic number, because the mean of its divisors is an integer number (25844610).

Almost surely, 2^51689219 is an apocalyptic number.

51689219 is a deficient number, since it is larger than the sum of its proper divisors (1).

51689219 is an equidigital number, since it uses as much as digits as its factorization.

51689219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 41.

The square root of 51689219 is about 7189.5214722539. The cubic root of 51689219 is about 372.5060437738.

The spelling of 51689219 in words is "fifty-one million, six hundred eighty-nine thousand, two hundred nineteen".