671200209 has 8 divisors (see below), whose sum is σ = 994370720. Its totient is φ = 447466788.

The previous prime is 671200199. The next prime is 671200219. The reversal of 671200209 is 902002176.

It is an interprime number because it is at equal distance from previous prime (671200199) and next prime (671200219).

It is not a de Polignac number, because 671200209 - 2⁵ = 671200177 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 24859267 = 671200209 / (6 + 7 + 1 + 2 + 0 + 0 + 2 + 0 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671200219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12429607 + ... + 12429660.

It is an arithmetic number, because the mean of its divisors is an integer number (124296340).

Almost surely, 2^671200209 is an apocalyptic number.

It is an amenable number.

671200209 is a deficient number, since it is larger than the sum of its proper divisors (323170511).

671200209 is a wasteful number, since it uses less digits than its factorization.

671200209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24859276 (or 24859270 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 671200209 is about 25907.5318971144. The cubic root of 671200209 is about 875.5561999509.

The spelling of 671200209 in words is "six hundred seventy-one million, two hundred thousand, two hundred nine".