671215123 has 4 divisors (see below), whose sum is σ = 671350680. Its totient is φ = 671079568.

The previous prime is 671215117. The next prime is 671215157. The reversal of 671215123 is 321512176.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 671215123 - 2⁵ = 671215091 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 671215091 and 671215100.

It is not an unprimeable number, because it can be changed into a prime (671215183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60058 + ... + 70351.

It is an arithmetic number, because the mean of its divisors is an integer number (167837670).

Almost surely, 2^671215123 is an apocalyptic number.

671215123 is a deficient number, since it is larger than the sum of its proper divisors (135557).

671215123 is a wasteful number, since it uses less digits than its factorization.

671215123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135556.

The product of its digits is 2520, while the sum is 28.

The square root of 671215123 is about 25907.8197268701. The cubic root of 671215123 is about 875.5626848259.

Adding to 671215123 its reverse (321512176), we get a palindrome (992727299).

The spelling of 671215123 in words is "six hundred seventy-one million, two hundred fifteen thousand, one hundred twenty-three".