1671671791 has 2 divisors, whose sum is σ = 1671671792. Its totient is φ = 1671671790.

The previous prime is 1671671779. The next prime is 1671671801. The reversal of 1671671791 is 1971761761.

It is a strong prime.

It is an emirp because it is prime and its reverse (1971761761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1671671791 - 2⁹ = 1671671279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1671671731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835835895 + 835835896.

It is an arithmetic number, because the mean of its divisors is an integer number (835835896).

Almost surely, 2^1671671791 is an apocalyptic number.

1671671791 is a deficient number, since it is larger than the sum of its proper divisors (1).

1671671791 is an equidigital number, since it uses as much as digits as its factorization.

1671671791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 111132, while the sum is 46.

The square root of 1671671791 is about 40886.0830968191. The cubic root of 1671671791 is about 1186.8167616276.

The spelling of 1671671791 in words is "one billion, six hundred seventy-one million, six hundred seventy-one thousand, seven hundred ninety-one".