1663311 has 8 divisors (see below), whose sum is σ = 2388400. Its totient is φ = 1023552.

The previous prime is 1663309. The next prime is 1663327. The reversal of 1663311 is 1133661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1663311 - 2¹ = 1663309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21286 + ... + 21363.

It is an arithmetic number, because the mean of its divisors is an integer number (298550).

2^1663311 is an apocalyptic number.

1663311 is a deficient number, since it is larger than the sum of its proper divisors (725089).

1663311 is a wasteful number, since it uses less digits than its factorization.

1663311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42665.

The product of its digits is 324, while the sum is 21.

The square root of 1663311 is about 1289.6941497890. The cubic root of 1663311 is about 118.4834850313.

Adding to 1663311 its reverse (1133661), we get a palindrome (2796972).

The spelling of 1663311 in words is "one million, six hundred sixty-three thousand, three hundred eleven".