671373121 has 4 divisors (see below), whose sum is σ = 671425200. Its totient is φ = 671321044.

The previous prime is 671373119. The next prime is 671373133. The reversal of 671373121 is 121373176.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 671373121 - 2¹ = 671373119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671373161) 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, 9150 + ... + 37768.

It is an arithmetic number, because the mean of its divisors is an integer number (167856300).

Almost surely, 2^671373121 is an apocalyptic number.

It is an amenable number.

671373121 is a deficient number, since it is larger than the sum of its proper divisors (52079).

671373121 is a wasteful number, since it uses less digits than its factorization.

671373121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52078.

The product of its digits is 5292, while the sum is 31.

The square root of 671373121 is about 25910.8687812663. The cubic root of 671373121 is about 875.6313792953.

Subtracting from 671373121 its reverse (121373176), we obtain a palindrome (549999945).

The spelling of 671373121 in words is "six hundred seventy-one million, three hundred seventy-three thousand, one hundred twenty-one".