671770217 has 4 divisors (see below), whose sum is σ = 693440256. Its totient is φ = 650100180.

The previous prime is 671770193. The next prime is 671770243. The reversal of 671770217 is 712077176.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 671770217 - 2²² = 667575913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671770277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10834973 + ... + 10835034.

It is an arithmetic number, because the mean of its divisors is an integer number (173360064).

Almost surely, 2^671770217 is an apocalyptic number.

It is an amenable number.

671770217 is a deficient number, since it is larger than the sum of its proper divisors (21670039).

671770217 is a wasteful number, since it uses less digits than its factorization.

671770217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21670038.

The product of its (nonzero) digits is 28812, while the sum is 38.

The square root of 671770217 is about 25918.5303788621. The cubic root of 671770217 is about 875.8039813734.

The spelling of 671770217 in words is "six hundred seventy-one million, seven hundred seventy thousand, two hundred seventeen".