671189917 has 2 divisors, whose sum is σ = 671189918. Its totient is φ = 671189916.

The previous prime is 671189873. The next prime is 671189929. The reversal of 671189917 is 719981176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 418570681 + 252619236 = 20459^2 + 15894^2 .

It is a cyclic number.

It is not a de Polignac number, because 671189917 - 2⁷ = 671189789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671189957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335594958 + 335594959.

It is an arithmetic number, because the mean of its divisors is an integer number (335594959).

Almost surely, 2^671189917 is an apocalyptic number.

It is an amenable number.

671189917 is a deficient number, since it is larger than the sum of its proper divisors (1).

671189917 is an equidigital number, since it uses as much as digits as its factorization.

671189917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 49.

The square root of 671189917 is about 25907.3332668571. Note that the first 3 decimals coincide. The cubic root of 671189917 is about 875.5517247484.

The spelling of 671189917 in words is "six hundred seventy-one million, one hundred eighty-nine thousand, nine hundred seventeen".