671560217 has 2 divisors, whose sum is σ = 671560218. Its totient is φ = 671560216.

The previous prime is 671560213. The next prime is 671560259. The reversal of 671560217 is 712065176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 668791321 + 2768896 = 25861^2 + 1664^2 .

It is a cyclic number.

It is not a de Polignac number, because 671560217 - 2² = 671560213 is a prime.

It is not a weakly prime, because it can be changed into another prime (671560213) 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, 335780108 + 335780109.

It is an arithmetic number, because the mean of its divisors is an integer number (335780109).

Almost surely, 2^671560217 is an apocalyptic number.

It is an amenable number.

671560217 is a deficient number, since it is larger than the sum of its proper divisors (1).

671560217 is an equidigital number, since it uses as much as digits as its factorization.

671560217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 671560217 is about 25914.4789065881. The cubic root of 671560217 is about 875.7127110751.

The spelling of 671560217 in words is "six hundred seventy-one million, five hundred sixty thousand, two hundred seventeen".