1669073281 has 2 divisors, whose sum is σ = 1669073282. Its totient is φ = 1669073280.

The previous prime is 1669073267. The next prime is 1669073303. The reversal of 1669073281 is 1823709661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1494595600 + 174477681 = 38660^2 + 13209^2 .

It is a cyclic number.

It is not a de Polignac number, because 1669073281 - 2¹⁹ = 1668548993 is a prime.

It is a super-2 number, since 2×1669073281² = 5571611234696209922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1669071281) 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, 834536640 + 834536641.

It is an arithmetic number, because the mean of its divisors is an integer number (834536641).

Almost surely, 2^1669073281 is an apocalyptic number.

It is an amenable number.

1669073281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1669073281 is an equidigital number, since it uses as much as digits as its factorization.

1669073281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 1669073281 is about 40854.2932994808. The cubic root of 1669073281 is about 1186.2014984002.

The spelling of 1669073281 in words is "one billion, six hundred sixty-nine million, seventy-three thousand, two hundred eighty-one".