671969279 has 2 divisors, whose sum is σ = 671969280. Its totient is φ = 671969278.

The previous prime is 671969239. The next prime is 671969281. The reversal of 671969279 is 972969176.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 671969279 - 2¹² = 671965183 is a prime.

Together with 671969281, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671969239) 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, 335984639 + 335984640.

It is an arithmetic number, because the mean of its divisors is an integer number (335984640).

Almost surely, 2^671969279 is an apocalyptic number.

671969279 is a deficient number, since it is larger than the sum of its proper divisors (1).

671969279 is an equidigital number, since it uses as much as digits as its factorization.

671969279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2571912, while the sum is 56.

The square root of 671969279 is about 25922.3702427074. The cubic root of 671969279 is about 875.8904802337.

The spelling of 671969279 in words is "six hundred seventy-one million, nine hundred sixty-nine thousand, two hundred seventy-nine".