1231440443 has 2 divisors, whose sum is σ = 1231440444. Its totient is φ = 1231440442.

The previous prime is 1231440437. The next prime is 1231440451. The reversal of 1231440443 is 3440441321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231440443 - 2²⁰ = 1230391867 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231440403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615720221 + 615720222.

It is an arithmetic number, because the mean of its divisors is an integer number (615720222).

Almost surely, 2^1231440443 is an apocalyptic number.

1231440443 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231440443 is an equidigital number, since it uses as much as digits as its factorization.

1231440443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 1231440443 is about 35091.8857145067. The cubic root of 1231440443 is about 1071.8593585797.

Adding to 1231440443 its reverse (3440441321), we get a palindrome (4671881764).

The spelling of 1231440443 in words is "one billion, two hundred thirty-one million, four hundred forty thousand, four hundred forty-three".