1231054543 has 2 divisors, whose sum is σ = 1231054544. Its totient is φ = 1231054542.

The previous prime is 1231054523. The next prime is 1231054549. The reversal of 1231054543 is 3454501321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1231054543 - 2⁵ = 1231054511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231054549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615527271 + 615527272.

It is an arithmetic number, because the mean of its divisors is an integer number (615527272).

Almost surely, 2^1231054543 is an apocalyptic number.

1231054543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231054543 is an equidigital number, since it uses as much as digits as its factorization.

1231054543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 1231054543 is about 35086.3868615735. The cubic root of 1231054543 is about 1071.7473830086.

Adding to 1231054543 its reverse (3454501321), we get a palindrome (4685555864).

The spelling of 1231054543 in words is "one billion, two hundred thirty-one million, fifty-four thousand, five hundred forty-three".