80686999 has 2 divisors, whose sum is σ = 80687000. Its totient is φ = 80686998.

The previous prime is 80686951. The next prime is 80687003. The reversal of 80686999 is 99968608.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 80686999 - 2¹⁷ = 80555927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80686909) 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, 40343499 + 40343500.

It is an arithmetic number, because the mean of its divisors is an integer number (40343500).

Almost surely, 2^80686999 is an apocalyptic number.

80686999 is a deficient number, since it is larger than the sum of its proper divisors (1).

80686999 is an equidigital number, since it uses as much as digits as its factorization.

80686999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1679616, while the sum is 55.

The square root of 80686999 is about 8982.5942243875. The cubic root of 80686999 is about 432.1168361824.

The spelling of 80686999 in words is "eighty million, six hundred eighty-six thousand, nine hundred ninety-nine".