1143111431 has 32 divisors (see below), whose sum is σ = 1508253696. Its totient is φ = 839916000.

The previous prime is 1143111419. The next prime is 1143111439. The reversal of 1143111431 is 1341113411.

It is not a de Polignac number, because 1143111431 - 2¹⁸ = 1142849287 is a prime.

It is a super-2 number, since 2×1143111431² = 2613407487365735522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143111439) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 121196 + ... + 130286.

It is an arithmetic number, because the mean of its divisors is an integer number (47132928).

Almost surely, 2^1143111431 is an apocalyptic number.

1143111431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1143111431 is a deficient number, since it is larger than the sum of its proper divisors (365142265).

1143111431 is a wasteful number, since it uses less digits than its factorization.

1143111431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9203.

The product of its digits is 144, while the sum is 20.

The square root of 1143111431 is about 33809.9309523104. The cubic root of 1143111431 is about 1045.5934545701.

Adding to 1143111431 its reverse (1341113411), we get a palindrome (2484224842).

The spelling of 1143111431 in words is "one billion, one hundred forty-three million, one hundred eleven thousand, four hundred thirty-one".