671423213 has 4 divisors (see below), whose sum is σ = 671637468. Its totient is φ = 671208960.

The previous prime is 671423173. The next prime is 671423231. The reversal of 671423213 is 312324176.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 184470724 + 486952489 = 13582^2 + 22067^2 .

It is a cyclic number.

It is not a de Polignac number, because 671423213 - 2⁶ = 671423149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671423713) 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, 102356 + ... + 108717.

It is an arithmetic number, because the mean of its divisors is an integer number (167909367).

Almost surely, 2^671423213 is an apocalyptic number.

It is an amenable number.

671423213 is a deficient number, since it is larger than the sum of its proper divisors (214255).

671423213 is a wasteful number, since it uses less digits than its factorization.

671423213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214254.

The product of its digits is 6048, while the sum is 29.

The square root of 671423213 is about 25911.8353846268. The cubic root of 671423213 is about 875.6531560762.

Adding to 671423213 its reverse (312324176), we get a palindrome (983747389).

The spelling of 671423213 in words is "six hundred seventy-one million, four hundred twenty-three thousand, two hundred thirteen".