1131563 has 4 divisors (see below), whose sum is σ = 1148520. Its totient is φ = 1114608.

The previous prime is 1131553. The next prime is 1131569. The reversal of 1131563 is 3651311.

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: 3651311 = 17 ⋅214783.

It is a cyclic number.

It is not a de Polignac number, because 1131563 - 2⁴ = 1131547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131569) 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, 8378 + ... + 8511.

It is an arithmetic number, because the mean of its divisors is an integer number (287130).

2^1131563 is an apocalyptic number.

1131563 is a deficient number, since it is larger than the sum of its proper divisors (16957).

1131563 is an equidigital number, since it uses as much as digits as its factorization.

1131563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16956.

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

The square root of 1131563 is about 1063.7495005874. The cubic root of 1131563 is about 104.2060449164.

Adding to 1131563 its reverse (3651311), we get a palindrome (4782874).

The spelling of 1131563 in words is "one million, one hundred thirty-one thousand, five hundred sixty-three".