79278271 has 2 divisors, whose sum is σ = 79278272. Its totient is φ = 79278270.

The previous prime is 79278167. The next prime is 79278299. The reversal of 79278271 is 17287297.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (17287297) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79278271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79278371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39639135 + 39639136.

It is an arithmetic number, because the mean of its divisors is an integer number (39639136).

Almost surely, 2^79278271 is an apocalyptic number.

79278271 is a deficient number, since it is larger than the sum of its proper divisors (1).

79278271 is an equidigital number, since it uses as much as digits as its factorization.

79278271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98784, while the sum is 43.

The square root of 79278271 is about 8903.8346233519. The cubic root of 79278271 is about 429.5872567330.

The spelling of 79278271 in words is "seventy-nine million, two hundred seventy-eight thousand, two hundred seventy-one".