671603 has 2 divisors, whose sum is σ = 671604. Its totient is φ = 671602.

The previous prime is 671591. The next prime is 671609. The reversal of 671603 is 306176.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 671603 - 2¹² = 667507 is a prime.

It is not a weakly prime, because it can be changed into another prime (671609) 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, 335801 + 335802.

It is an arithmetic number, because the mean of its divisors is an integer number (335802).

2⁶⁷¹⁶⁰³ is an apocalyptic number.

671603 is a deficient number, since it is larger than the sum of its proper divisors (1).

671603 is an equidigital number, since it uses as much as digits as its factorization.

671603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 671603 is about 819.5138802973. The cubic root of 671603 is about 87.5731306986.

Adding to 671603 its reverse (306176), we get a palindrome (977779).

The spelling of 671603 in words is "six hundred seventy-one thousand, six hundred three".