1670561489 has 2 divisors, whose sum is σ = 1670561490. Its totient is φ = 1670561488.

The previous prime is 1670561351. The next prime is 1670561509. The reversal of 1670561489 is 9841650761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1624090000 + 46471489 = 40300^2 + 6817^2 .

It is a cyclic number.

It is not a de Polignac number, because 1670561489 - 2²⁰ = 1669512913 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1670561689) 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, 835280744 + 835280745.

It is an arithmetic number, because the mean of its divisors is an integer number (835280745).

Almost surely, 2^1670561489 is an apocalyptic number.

It is an amenable number.

1670561489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1670561489 is an equidigital number, since it uses as much as digits as its factorization.

1670561489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 1670561489 is about 40872.5028472688. The cubic root of 1670561489 is about 1186.5539475040.

The spelling of 1670561489 in words is "one billion, six hundred seventy million, five hundred sixty-one thousand, four hundred eighty-nine".