671381719 has 2 divisors, whose sum is σ = 671381720. Its totient is φ = 671381718.

The previous prime is 671381693. The next prime is 671381729. The reversal of 671381719 is 917183176.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 671381719 - 2¹⁹ = 670857431 is a prime.

It is a super-2 number, since 2×671381719² = 901506825214789922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671381729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335690859 + 335690860.

It is an arithmetic number, because the mean of its divisors is an integer number (335690860).

Almost surely, 2^671381719 is an apocalyptic number.

671381719 is a deficient number, since it is larger than the sum of its proper divisors (1).

671381719 is an equidigital number, since it uses as much as digits as its factorization.

671381719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 43.

The square root of 671381719 is about 25911.0346956659. The cubic root of 671381719 is about 875.6351172299.

The spelling of 671381719 in words is "six hundred seventy-one million, three hundred eighty-one thousand, seven hundred nineteen".