671055961 has 2 divisors, whose sum is σ = 671055962. Its totient is φ = 671055960.

The previous prime is 671055947. The next prime is 671055967. The reversal of 671055961 is 169550176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 434972736 + 236083225 = 20856^2 + 15365^2 .

It is a cyclic number.

It is not a de Polignac number, because 671055961 - 2¹⁵ = 671023193 is a prime.

It is a super-2 number, since 2×671055961² = 900632205587267042, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (671055967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335527980 + 335527981.

It is an arithmetic number, because the mean of its divisors is an integer number (335527981).

Almost surely, 2^671055961 is an apocalyptic number.

It is an amenable number.

671055961 is a deficient number, since it is larger than the sum of its proper divisors (1).

671055961 is an equidigital number, since it uses as much as digits as its factorization.

671055961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56700, while the sum is 40.

The square root of 671055961 is about 25904.7478466786. The cubic root of 671055961 is about 875.4934733716.

The spelling of 671055961 in words is "six hundred seventy-one million, fifty-five thousand, nine hundred sixty-one".