1121431343 has 4 divisors (see below), whose sum is σ = 1134942648. Its totient is φ = 1107920040.

The previous prime is 1121431331. The next prime is 1121431393. The reversal of 1121431343 is 3431341211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3431341211 = 53 ⋅64742287.

It is a cyclic number.

It is not a de Polignac number, because 1121431343 - 2¹² = 1121427247 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 (1121431313) 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, 6755528 + ... + 6755693.

It is an arithmetic number, because the mean of its divisors is an integer number (283735662).

Almost surely, 2^1121431343 is an apocalyptic number.

1121431343 is a deficient number, since it is larger than the sum of its proper divisors (13511305).

1121431343 is an equidigital number, since it uses as much as digits as its factorization.

1121431343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13511304.

The product of its digits is 864, while the sum is 23.

The square root of 1121431343 is about 33487.7790096626. The cubic root of 1121431343 is about 1038.9410272889.

Adding to 1121431343 its reverse (3431341211), we get a palindrome (4552772554).

The spelling of 1121431343 in words is "one billion, one hundred twenty-one million, four hundred thirty-one thousand, three hundred forty-three".