79916987 has 2 divisors, whose sum is σ = 79916988. Its totient is φ = 79916986.

The previous prime is 79916981. The next prime is 79917031. The reversal of 79916987 is 78961997.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79916987 - 2¹² = 79912891 is a prime.

It is a super-2 number, since 2×79916987² = 12773449622316338, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79916981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39958493 + 39958494.

It is an arithmetic number, because the mean of its divisors is an integer number (39958494).

Almost surely, 2^79916987 is an apocalyptic number.

79916987 is a deficient number, since it is larger than the sum of its proper divisors (1).

79916987 is an equidigital number, since it uses as much as digits as its factorization.

79916987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1714608, while the sum is 56.

The square root of 79916987 is about 8939.6301377630. The cubic root of 79916987 is about 430.7378480203.

The spelling of 79916987 in words is "seventy-nine million, nine hundred sixteen thousand, nine hundred eighty-seven".