1663273 has 2 divisors, whose sum is σ = 1663274. Its totient is φ = 1663272.

The previous prime is 1663267. The next prime is 1663289. The reversal of 1663273 is 3723661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1149184 + 514089 = 1072^2 + 717^2 .

It is a cyclic number.

It is not a de Polignac number, because 1663273 - 2⁹ = 1662761 is a prime.

It is not a weakly prime, because it can be changed into another prime (1663223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831636 + 831637.

It is an arithmetic number, because the mean of its divisors is an integer number (831637).

2^1663273 is an apocalyptic number.

It is an amenable number.

1663273 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663273 is an equidigital number, since it uses as much as digits as its factorization.

1663273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 28.

The square root of 1663273 is about 1289.6794175298. The cubic root of 1663273 is about 118.4825827333.

It can be divided in two parts, 1663 and 273, that added together give a square (1936 = 44²).

The spelling of 1663273 in words is "one million, six hundred sixty-three thousand, two hundred seventy-three".