1663009 has 2 divisors, whose sum is σ = 1663010. Its totient is φ = 1663008.

The previous prime is 1662979. The next prime is 1663027. The reversal of 1663009 is 9003661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1272384 + 390625 = 1128^2 + 625^2 .

It is a cyclic number.

It is not a de Polignac number, because 1663009 - 2⁵ = 1662977 is a prime.

It is equal to p₁₂₅₅₄₈ and since 1663009 and 125548 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1663099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831504 + 831505.

It is an arithmetic number, because the mean of its divisors is an integer number (831505).

2^1663009 is an apocalyptic number.

It is an amenable number.

1663009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663009 is an equidigital number, since it uses as much as digits as its factorization.

1663009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 1663009 is about 1289.5770624511. The cubic root of 1663009 is about 118.4763137570.

The spelling of 1663009 in words is "one million, six hundred sixty-three thousand, nine".