671602221 has 12 divisors (see below), whose sum is σ = 1027156572. Its totient is φ = 421397376.

The previous prime is 671602201. The next prime is 671602237. The reversal of 671602221 is 122206176.

It can be written as a sum of positive squares in 2 ways, for example, as 222755625 + 448846596 = 14925^2 + 21186^2 .

It is not a de Polignac number, because 671602221 - 2⁶ = 671602157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671602201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2194626 + ... + 2194931.

It is an arithmetic number, because the mean of its divisors is an integer number (85596381).

Almost surely, 2^671602221 is an apocalyptic number.

It is an amenable number.

671602221 is a deficient number, since it is larger than the sum of its proper divisors (355554351).

671602221 is a wasteful number, since it uses less digits than its factorization.

671602221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4389580 (or 4389577 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 671602221 is about 25915.2893288885. The cubic root of 671602221 is about 875.7309683954.

Adding to 671602221 its reverse (122206176), we get a palindrome (793808397).

The spelling of 671602221 in words is "six hundred seventy-one million, six hundred two thousand, two hundred twenty-one".