1001663 has 6 divisors (see below), whose sum is σ = 1084824. Its totient is φ = 924456.

The previous prime is 1001659. The next prime is 1001669. The reversal of 1001663 is 3661001.

It is not a de Polignac number, because 1001663 - 2² = 1001659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001669) 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 in 5 ways as a sum of consecutive naturals, for example, 2795 + ... + 3132.

It is an arithmetic number, because the mean of its divisors is an integer number (180804).

2^1001663 is an apocalyptic number.

1001663 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1001663 is a deficient number, since it is larger than the sum of its proper divisors (83161).

1001663 is an equidigital number, since it uses as much as digits as its factorization.

1001663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5953 (or 5940 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1001663 is about 1000.8311545910. The cubic root of 1001663 is about 100.0554026331.

Adding to 1001663 its reverse (3661001), we get a palindrome (4662664).

The spelling of 1001663 in words is "one million, one thousand, six hundred sixty-three".