1131323143 has 4 divisors (see below), whose sum is σ = 1131618528. Its totient is φ = 1131027760.

The previous prime is 1131323113. The next prime is 1131323161. The reversal of 1131323143 is 3413231311.

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 1131323143 - 2⁵ = 1131323111 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 (1131323113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141871 + ... + 149632.

It is an arithmetic number, because the mean of its divisors is an integer number (282904632).

Almost surely, 2^1131323143 is an apocalyptic number.

1131323143 is a deficient number, since it is larger than the sum of its proper divisors (295385).

1131323143 is an equidigital number, since it uses as much as digits as its factorization.

1131323143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295384.

The product of its digits is 648, while the sum is 22.

The square root of 1131323143 is about 33635.1474353837. The cubic root of 1131323143 is about 1041.9868155685.

Adding to 1131323143 its reverse (3413231311), we get a palindrome (4544554454).

The spelling of 1131323143 in words is "one billion, one hundred thirty-one million, three hundred twenty-three thousand, one hundred forty-three".