78281219 has 2 divisors, whose sum is σ = 78281220. Its totient is φ = 78281218.

The previous prime is 78281207. The next prime is 78281221. The reversal of 78281219 is 91218287.

It is a strong prime.

It is an emirp because it is prime and its reverse (91218287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78281219 - 2¹² = 78277123 is a prime.

It is a super-2 number, since 2×78281219² = 12255898496251922, which contains 22 as substring.

Together with 78281221, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78281249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39140609 + 39140610.

It is an arithmetic number, because the mean of its divisors is an integer number (39140610).

Almost surely, 2^78281219 is an apocalyptic number.

78281219 is a deficient number, since it is larger than the sum of its proper divisors (1).

78281219 is an equidigital number, since it uses as much as digits as its factorization.

78281219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 38.

The square root of 78281219 is about 8847.6674327192. The cubic root of 78281219 is about 427.7787364058.

The spelling of 78281219 in words is "seventy-eight million, two hundred eighty-one thousand, two hundred nineteen".