671854217 has 4 divisors (see below), whose sum is σ = 672176400. Its totient is φ = 671532036.

The previous prime is 671854189. The next prime is 671854241. The reversal of 671854217 is 712458176.

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 671854217 - 2⁶ = 671854153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671254217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157943 + ... + 162140.

It is an arithmetic number, because the mean of its divisors is an integer number (168044100).

Almost surely, 2^671854217 is an apocalyptic number.

It is an amenable number.

671854217 is a deficient number, since it is larger than the sum of its proper divisors (322183).

671854217 is a wasteful number, since it uses less digits than its factorization.

671854217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322182.

The product of its digits is 94080, while the sum is 41.

The square root of 671854217 is about 25920.1507904564. The cubic root of 671854217 is about 875.8404841667.

The spelling of 671854217 in words is "six hundred seventy-one million, eight hundred fifty-four thousand, two hundred seventeen".