671844379 has 2 divisors, whose sum is σ = 671844380. Its totient is φ = 671844378.

The previous prime is 671844359. The next prime is 671844391. The reversal of 671844379 is 973448176.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 671844379 - 2⁵ = 671844347 is a prime.

It is not a weakly prime, because it can be changed into another prime (671844319) 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, 335922189 + 335922190.

It is an arithmetic number, because the mean of its divisors is an integer number (335922190).

Almost surely, 2^671844379 is an apocalyptic number.

671844379 is a deficient number, since it is larger than the sum of its proper divisors (1).

671844379 is an equidigital number, since it uses as much as digits as its factorization.

671844379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 49.

The square root of 671844379 is about 25919.9610146312. The cubic root of 671844379 is about 875.8362091517.

The spelling of 671844379 in words is "six hundred seventy-one million, eight hundred forty-four thousand, three hundred seventy-nine".