80978279 has 2 divisors, whose sum is σ = 80978280. Its totient is φ = 80978278.

The previous prime is 80978273. The next prime is 80978281. The reversal of 80978279 is 97287908.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 80978279 - 2⁴ = 80978263 is a prime.

Together with 80978281, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80978273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40489139 + 40489140.

It is an arithmetic number, because the mean of its divisors is an integer number (40489140).

Almost surely, 2^80978279 is an apocalyptic number.

80978279 is a deficient number, since it is larger than the sum of its proper divisors (1).

80978279 is an equidigital number, since it uses as much as digits as its factorization.

80978279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 50.

The square root of 80978279 is about 8998.7931968681. The cubic root of 80978279 is about 432.6361921989.

The spelling of 80978279 in words is "eighty million, nine hundred seventy-eight thousand, two hundred seventy-nine".