671721683 has 2 divisors, whose sum is σ = 671721684. Its totient is φ = 671721682.

The previous prime is 671721641. The next prime is 671721709. The reversal of 671721683 is 386127176.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 671721683 - 2¹⁰ = 671720659 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 671721683.

It is not a weakly prime, because it can be changed into another prime (671721613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335860841 + 335860842.

It is an arithmetic number, because the mean of its divisors is an integer number (335860842).

Almost surely, 2^671721683 is an apocalyptic number.

671721683 is a deficient number, since it is larger than the sum of its proper divisors (1).

671721683 is an equidigital number, since it uses as much as digits as its factorization.

671721683 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 41.

The square root of 671721683 is about 25917.5940820131. The cubic root of 671721683 is about 875.7828891938.

The spelling of 671721683 in words is "six hundred seventy-one million, seven hundred twenty-one thousand, six hundred eighty-three".