671294209 has 2 divisors, whose sum is σ = 671294210. Its totient is φ = 671294208.

The previous prime is 671294201. The next prime is 671294269. The reversal of 671294209 is 902492176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 656640625 + 14653584 = 25625^2 + 3828^2 .

It is a cyclic number.

It is not a de Polignac number, because 671294209 - 2³ = 671294201 is a prime.

It is not a weakly prime, because it can be changed into another prime (671294201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335647104 + 335647105.

It is an arithmetic number, because the mean of its divisors is an integer number (335647105).

Almost surely, 2^671294209 is an apocalyptic number.

It is an amenable number.

671294209 is a deficient number, since it is larger than the sum of its proper divisors (1).

671294209 is an equidigital number, since it uses as much as digits as its factorization.

671294209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 671294209 is about 25909.3459778513. The cubic root of 671294209 is about 875.5970712338.

The spelling of 671294209 in words is "six hundred seventy-one million, two hundred ninety-four thousand, two hundred nine".