671633 has 2 divisors, whose sum is σ = 671634. Its totient is φ = 671632.

The previous prime is 671609. The next prime is 671647. The reversal of 671633 is 336176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 652864 + 18769 = 808^2 + 137^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (671603) 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, 335816 + 335817.

It is an arithmetic number, because the mean of its divisors is an integer number (335817).

2⁶⁷¹⁶³³ is an apocalyptic number.

It is an amenable number.

671633 is a deficient number, since it is larger than the sum of its proper divisors (1).

671633 is an equidigital number, since it uses as much as digits as its factorization.

671633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 26.

The square root of 671633 is about 819.5321836267. The cubic root of 671633 is about 87.5744346211.

The spelling of 671633 in words is "six hundred seventy-one thousand, six hundred thirty-three".