671123205 has 32 divisors (see below), whose sum is σ = 1225363200. Its totient is φ = 348255936.

The previous prime is 671123179. The next prime is 671123207. The reversal of 671123205 is 502321176.

It is a happy number.

It is not a de Polignac number, because 671123205 - 2⁷ = 671123077 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671123207) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62185 + ... + 72174.

It is an arithmetic number, because the mean of its divisors is an integer number (38292600).

Almost surely, 2^671123205 is an apocalyptic number.

It is an amenable number.

671123205 is a deficient number, since it is larger than the sum of its proper divisors (554239995).

671123205 is a wasteful number, since it uses less digits than its factorization.

671123205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134410 (or 134404 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 671123205 is about 25906.0457229582. The cubic root of 671123205 is about 875.5227157002.

The spelling of 671123205 in words is "six hundred seventy-one million, one hundred twenty-three thousand, two hundred five".