1671144857 has 2 divisors, whose sum is σ = 1671144858. Its totient is φ = 1671144856.

The previous prime is 1671144847. The next prime is 1671144859. The reversal of 1671144857 is 7584411761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1483482256 + 187662601 = 38516^2 + 13699^2 .

It is a cyclic number.

It is not a de Polignac number, because 1671144857 - 2⁴ = 1671144841 is a prime.

Together with 1671144859, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1671144859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835572428 + 835572429.

It is an arithmetic number, because the mean of its divisors is an integer number (835572429).

Almost surely, 2^1671144857 is an apocalyptic number.

It is an amenable number.

1671144857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1671144857 is an equidigital number, since it uses as much as digits as its factorization.

1671144857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 188160, while the sum is 44.

The square root of 1671144857 is about 40879.6386603404. The cubic root of 1671144857 is about 1186.6920481866.

The spelling of 1671144857 in words is "one billion, six hundred seventy-one million, one hundred forty-four thousand, eight hundred fifty-seven".