1311563 has 4 divisors (see below), whose sum is σ = 1430808. Its totient is φ = 1192320.

The previous prime is 1311559. The next prime is 1311577. The reversal of 1311563 is 3651131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3651131 = 11 ⋅331921.

It is a cyclic number.

It is not a de Polignac number, because 1311563 - 2² = 1311559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59606 + ... + 59627.

It is an arithmetic number, because the mean of its divisors is an integer number (357702).

2^1311563 is an apocalyptic number.

1311563 is a deficient number, since it is larger than the sum of its proper divisors (119245).

1311563 is a wasteful number, since it uses less digits than its factorization.

1311563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119244.

The product of its digits is 270, while the sum is 20.

The square root of 1311563 is about 1145.2349104005. The cubic root of 1311563 is about 109.4619176315.

Adding to 1311563 its reverse (3651131), we get a palindrome (4962694).

The spelling of 1311563 in words is "one million, three hundred eleven thousand, five hundred sixty-three".