1671671779 has 2 divisors, whose sum is σ = 1671671780. Its totient is φ = 1671671778.

The previous prime is 1671671747. The next prime is 1671671791. The reversal of 1671671779 is 9771761761.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1671671779 - 2⁵ = 1671671747 is a prime.

It is not a weakly prime, because it can be changed into another prime (1671671719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835835889 + 835835890.

It is an arithmetic number, because the mean of its divisors is an integer number (835835890).

Almost surely, 2^1671671779 is an apocalyptic number.

1671671779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1671671779 is an equidigital number, since it uses as much as digits as its factorization.

1671671779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 777924, while the sum is 52.

The square root of 1671671779 is about 40886.0829500699. The cubic root of 1671671779 is about 1186.8167587877.

The spelling of 1671671779 in words is "one billion, six hundred seventy-one million, six hundred seventy-one thousand, seven hundred seventy-nine".