1663289 has 2 divisors, whose sum is σ = 1663290. Its totient is φ = 1663288.

The previous prime is 1663273. The next prime is 1663301. The reversal of 1663289 is 9823661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 883600 + 779689 = 940^2 + 883^2 .

It is an emirp because it is prime and its reverse (9823661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1663289 - 2⁴ = 1663273 is a prime.

It is not a weakly prime, because it can be changed into another prime (1663219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831644 + 831645.

It is an arithmetic number, because the mean of its divisors is an integer number (831645).

2^1663289 is an apocalyptic number.

It is an amenable number.

1663289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663289 is an equidigital number, since it uses as much as digits as its factorization.

1663289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 35.

The square root of 1663289 is about 1289.6856206068. The cubic root of 1663289 is about 118.4829626499.

The spelling of 1663289 in words is "one million, six hundred sixty-three thousand, two hundred eighty-nine".