686773979 has 2 divisors, whose sum is σ = 686773980. Its totient is φ = 686773978.

The previous prime is 686773961. The next prime is 686773991. The reversal of 686773979 is 979377686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 686773979 - 2⁸ = 686773723 is a prime.

It is not a weakly prime, because it can be changed into another prime (686773949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343386989 + 343386990.

It is an arithmetic number, because the mean of its divisors is an integer number (343386990).

Almost surely, 2^686773979 is an apocalyptic number.

686773979 is a deficient number, since it is larger than the sum of its proper divisors (1).

686773979 is an equidigital number, since it uses as much as digits as its factorization.

686773979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24004512, while the sum is 62.

The square root of 686773979 is about 26206.3728699719. The cubic root of 686773979 is about 882.2762947651.

The spelling of 686773979 in words is "six hundred eighty-six million, seven hundred seventy-three thousand, nine hundred seventy-nine".