1231403543 has 2 divisors, whose sum is σ = 1231403544. Its totient is φ = 1231403542.

The previous prime is 1231403531. The next prime is 1231403587. The reversal of 1231403543 is 3453041321.

It is a weak prime.

It is an emirp because it is prime and its reverse (3453041321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231403543 - 2⁴ = 1231403527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231403843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615701771 + 615701772.

It is an arithmetic number, because the mean of its divisors is an integer number (615701772).

Almost surely, 2^1231403543 is an apocalyptic number.

1231403543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231403543 is an equidigital number, since it uses as much as digits as its factorization.

1231403543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 1231403543 is about 35091.3599479986. The cubic root of 1231403543 is about 1071.8486524170.

Adding to 1231403543 its reverse (3453041321), we get a palindrome (4684444864).

The spelling of 1231403543 in words is "one billion, two hundred thirty-one million, four hundred three thousand, five hundred forty-three".