1311663 has 8 divisors (see below), whose sum is σ = 1754800. Its totient is φ = 871488.

The previous prime is 1311643. The next prime is 1311689. The reversal of 1311663 is 3661131.

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

It is not a de Polignac number, because 1311663 - 2⁶ = 1311599 is a prime.

It is a Duffinian number.

1311663 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 693 + ... + 1761.

It is an arithmetic number, because the mean of its divisors is an integer number (219350).

2^1311663 is an apocalyptic number.

1311663 is a deficient number, since it is larger than the sum of its proper divisors (443137).

1311663 is a wasteful number, since it uses less digits than its factorization.

1311663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1481.

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

The square root of 1311663 is about 1145.2785687334. The cubic root of 1311663 is about 109.4646995321.

Adding to 1311663 its reverse (3661131), we get a palindrome (4972794).

The spelling of 1311663 in words is "one million, three hundred eleven thousand, six hundred sixty-three".