79278919 has 2 divisors, whose sum is σ = 79278920. Its totient is φ = 79278918.

The previous prime is 79278917. The next prime is 79278923. The reversal of 79278919 is 91987297.

It is a weak prime.

It is an emirp because it is prime and its reverse (91987297) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79278919 - 2¹ = 79278917 is a prime.

It is a super-2 number, since 2×79278919² = 12570293995617122, which contains 22 as substring.

Together with 79278917, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79278911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39639459 + 39639460.

It is an arithmetic number, because the mean of its divisors is an integer number (39639460).

Almost surely, 2^79278919 is an apocalyptic number.

79278919 is a deficient number, since it is larger than the sum of its proper divisors (1).

79278919 is an equidigital number, since it uses as much as digits as its factorization.

79278919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 571536, while the sum is 52.

The square root of 79278919 is about 8903.8710120936. The cubic root of 79278919 is about 429.5884271747.

The spelling of 79278919 in words is "seventy-nine million, two hundred seventy-eight thousand, nine hundred nineteen".