679479991 has 2 divisors, whose sum is σ = 679479992. Its totient is φ = 679479990.

The previous prime is 679479967. The next prime is 679480013. The reversal of 679479991 is 199974976.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 679479991 - 2¹⁷ = 679348919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (679479191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339739995 + 339739996.

It is an arithmetic number, because the mean of its divisors is an integer number (339739996).

Almost surely, 2^679479991 is an apocalyptic number.

679479991 is a deficient number, since it is larger than the sum of its proper divisors (1).

679479991 is an equidigital number, since it uses as much as digits as its factorization.

679479991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7715736, while the sum is 61.

The square root of 679479991 is about 26066.8369964597. The cubic root of 679479991 is about 879.1417212881.

The spelling of 679479991 in words is "six hundred seventy-nine million, four hundred seventy-nine thousand, nine hundred ninety-one".