80312779 has 2 divisors, whose sum is σ = 80312780. Its totient is φ = 80312778.

The previous prime is 80312773. The next prime is 80312789. The reversal of 80312779 is 97721308.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80312779 is a prime.

It is not a weakly prime, because it can be changed into another prime (80312773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40156389 + 40156390.

It is an arithmetic number, because the mean of its divisors is an integer number (40156390).

Almost surely, 2^80312779 is an apocalyptic number.

80312779 is a deficient number, since it is larger than the sum of its proper divisors (1).

80312779 is an equidigital number, since it uses as much as digits as its factorization.

80312779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 80312779 is about 8961.7397306550. The cubic root of 80312779 is about 431.4477593587.

The spelling of 80312779 in words is "eighty million, three hundred twelve thousand, seven hundred seventy-nine".