1131543403 has 4 divisors (see below), whose sum is σ = 1138319280. Its totient is φ = 1124767528.

The previous prime is 1131543383. The next prime is 1131543421. The reversal of 1131543403 is 3043451311.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1131543403 - 2²⁵ = 1097988971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131543463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3387688 + ... + 3388021.

It is an arithmetic number, because the mean of its divisors is an integer number (284579820).

Almost surely, 2^1131543403 is an apocalyptic number.

1131543403 is a deficient number, since it is larger than the sum of its proper divisors (6775877).

1131543403 is an equidigital number, since it uses as much as digits as its factorization.

1131543403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6775876.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 1131543403 is about 33638.4215295546. The cubic root of 1131543403 is about 1042.0544334796.

Adding to 1131543403 its reverse (3043451311), we get a palindrome (4174994714).

The spelling of 1131543403 in words is "one billion, one hundred thirty-one million, five hundred forty-three thousand, four hundred three".