1671643793 has 2 divisors, whose sum is σ = 1671643794. Its totient is φ = 1671643792.

The previous prime is 1671643739. The next prime is 1671643823. The reversal of 1671643793 is 3973461761.

Together with previous prime (1671643739) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1177381969 + 494261824 = 34313^2 + 22232^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1671643793 is a prime.

It is not a weakly prime, because it can be changed into another prime (1671643733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835821896 + 835821897.

It is an arithmetic number, because the mean of its divisors is an integer number (835821897).

Almost surely, 2^1671643793 is an apocalyptic number.

It is an amenable number.

1671643793 is a deficient number, since it is larger than the sum of its proper divisors (1).

1671643793 is an equidigital number, since it uses as much as digits as its factorization.

1671643793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 571536, while the sum is 47.

The square root of 1671643793 is about 40885.7407050429. The cubic root of 1671643793 is about 1186.8101357892.

The spelling of 1671643793 in words is "one billion, six hundred seventy-one million, six hundred forty-three thousand, seven hundred ninety-three".