1663106 has 4 divisors (see below), whose sum is σ = 2494662. Its totient is φ = 831552.

The previous prime is 1663099. The next prime is 1663117. The reversal of 1663106 is 6013661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6013661 = 823 ⋅7307.

It can be written as a sum of positive squares in only one way, i.e., 1651225 + 11881 = 1285^2 + 109^2 .

It is an unprimeable number.

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, 415775 + ... + 415778.

2^1663106 is an apocalyptic number.

1663106 is a deficient number, since it is larger than the sum of its proper divisors (831556).

1663106 is an equidigital number, since it uses as much as digits as its factorization.

1663106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831555.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 1663106 is about 1289.6146711324. The cubic root of 1663106 is about 118.4786172080.

Adding to 1663106 its reverse (6013661), we get a palindrome (7676767).

The spelling of 1663106 in words is "one million, six hundred sixty-three thousand, one hundred six".