671770221 has 4 divisors (see below), whose sum is σ = 895693632. Its totient is φ = 447846812.

The previous prime is 671770193. The next prime is 671770243. The reversal of 671770221 is 122077176.

It is a happy number.

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 671770221 - 2⁵ = 671770189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671774221) 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, 111961701 + ... + 111961706.

It is an arithmetic number, because the mean of its divisors is an integer number (223923408).

Almost surely, 2^671770221 is an apocalyptic number.

It is an amenable number.

671770221 is a deficient number, since it is larger than the sum of its proper divisors (223923411).

671770221 is a wasteful number, since it uses less digits than its factorization.

671770221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223923410.

The product of its (nonzero) digits is 8232, while the sum is 33.

The square root of 671770221 is about 25918.5304560270. The cubic root of 671770221 is about 875.8039831117.

The spelling of 671770221 in words is "six hundred seventy-one million, seven hundred seventy thousand, two hundred twenty-one".