1131343431 has 4 divisors (see below), whose sum is σ = 1508457912. Its totient is φ = 754228952.

The previous prime is 1131343403. The next prime is 1131343453. The reversal of 1131343431 is 1343431311.

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 1131343431 - 2⁷ = 1131343303 is a prime.

It is a super-2 number, since 2×1131343431² = 2559875917733703522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131343471) 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, 188557236 + ... + 188557241.

It is an arithmetic number, because the mean of its divisors is an integer number (377114478).

Almost surely, 2^1131343431 is an apocalyptic number.

1131343431 is a deficient number, since it is larger than the sum of its proper divisors (377114481).

1131343431 is an equidigital number, since it uses as much as digits as its factorization.

1131343431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377114480.

The product of its digits is 1296, while the sum is 24.

The square root of 1131343431 is about 33635.4490233147. The cubic root of 1131343431 is about 1041.9930441756.

Adding to 1131343431 its reverse (1343431311), we get a palindrome (2474774742).

The spelling of 1131343431 in words is "one billion, one hundred thirty-one million, three hundred forty-three thousand, four hundred thirty-one".