671045873 has 2 divisors, whose sum is σ = 671045874. Its totient is φ = 671045872.

The previous prime is 671045863. The next prime is 671045909. The reversal of 671045873 is 378540176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 666517489 + 4528384 = 25817^2 + 2128^2 .

It is a cyclic number.

It is not a de Polignac number, because 671045873 - 2²⁰ = 669997297 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 671045873.

It is not a weakly prime, because it can be changed into another prime (671045833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335522936 + 335522937.

It is an arithmetic number, because the mean of its divisors is an integer number (335522937).

Almost surely, 2^671045873 is an apocalyptic number.

It is an amenable number.

671045873 is a deficient number, since it is larger than the sum of its proper divisors (1).

671045873 is an equidigital number, since it uses as much as digits as its factorization.

671045873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141120, while the sum is 41.

The square root of 671045873 is about 25904.5531326059. The cubic root of 671045873 is about 875.4890862450.

The spelling of 671045873 in words is "six hundred seventy-one million, forty-five thousand, eight hundred seventy-three".