679278491 has 2 divisors, whose sum is σ = 679278492. Its totient is φ = 679278490.

The previous prime is 679278473. The next prime is 679278497. The reversal of 679278491 is 194872976.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 679278491 - 2⁶ = 679278427 is a prime.

It is a super-2 number, since 2×679278491² = 922838536670474162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (679278497) 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, 339639245 + 339639246.

It is an arithmetic number, because the mean of its divisors is an integer number (339639246).

Almost surely, 2^679278491 is an apocalyptic number.

679278491 is a deficient number, since it is larger than the sum of its proper divisors (1).

679278491 is an equidigital number, since it uses as much as digits as its factorization.

679278491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 53.

The square root of 679278491 is about 26062.9716456125. The cubic root of 679278491 is about 879.0548094471.

The spelling of 679278491 in words is "six hundred seventy-nine million, two hundred seventy-eight thousand, four hundred ninety-one".