671081 has 2 divisors, whose sum is σ = 671082. Its totient is φ = 671080.

The previous prime is 671063. The next prime is 671087. The reversal of 671081 is 180176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 477481 + 193600 = 691^2 + 440^2 .

It is a cyclic number.

It is not a de Polignac number, because 671081 - 2⁶ = 671017 is a prime.

It is a super-2 number, since 2×671081² = 900699417122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (671087) 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, 335540 + 335541.

It is an arithmetic number, because the mean of its divisors is an integer number (335541).

2⁶⁷¹⁰⁸¹ is an apocalyptic number.

It is an amenable number.

671081 is a deficient number, since it is larger than the sum of its proper divisors (1).

671081 is an equidigital number, since it uses as much as digits as its factorization.

671081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 671081 is about 819.1953369008. The cubic root of 671081 is about 87.5504362284.

It can be divided in two parts, 67 and 1081, that multiplied together give a palindrome (72427).

The spelling of 671081 in words is "six hundred seventy-one thousand, eighty-one".