671307121 has 4 divisors (see below), whose sum is σ = 672355044. Its totient is φ = 670259200.

The previous prime is 671307097. The next prime is 671307137. The reversal of 671307121 is 121703176.

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 471367521 + 199939600 = 21711^2 + 14140^2 .

It is a cyclic number.

It is not a de Polignac number, because 671307121 - 2⁵ = 671307089 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 671307121.

It is not an unprimeable number, because it can be changed into a prime (671307151) 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, 523000 + ... + 524281.

It is an arithmetic number, because the mean of its divisors is an integer number (168088761).

Almost surely, 2^671307121 is an apocalyptic number.

It is an amenable number.

671307121 is a deficient number, since it is larger than the sum of its proper divisors (1047923).

671307121 is a wasteful number, since it uses less digits than its factorization.

671307121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1047922.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 671307121 is about 25909.5951531474. The cubic root of 671307121 is about 875.6026850848.

The spelling of 671307121 in words is "six hundred seventy-one million, three hundred seven thousand, one hundred twenty-one".