671307217 has 4 divisors (see below), whose sum is σ = 767208256. Its totient is φ = 575406180.

The previous prime is 671307209. The next prime is 671307223. The reversal of 671307217 is 712703176.

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 671307217 - 2³ = 671307209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671307517) 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, 47950509 + ... + 47950522.

It is an arithmetic number, because the mean of its divisors is an integer number (191802064).

Almost surely, 2^671307217 is an apocalyptic number.

It is an amenable number.

671307217 is a deficient number, since it is larger than the sum of its proper divisors (95901039).

671307217 is an equidigital number, since it uses as much as digits as its factorization.

671307217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95901038.

The product of its (nonzero) digits is 12348, while the sum is 34.

The square root of 671307217 is about 25909.5970057429. The cubic root of 671307217 is about 875.6027268232.

It can be divided in two parts, 67130 and 7217, that added together give a palindrome (74347).

The spelling of 671307217 in words is "six hundred seventy-one million, three hundred seven thousand, two hundred seventeen".