1231543207 has 2 divisors, whose sum is σ = 1231543208. Its totient is φ = 1231543206.

The previous prime is 1231543193. The next prime is 1231543217. The reversal of 1231543207 is 7023451321.

It is a strong prime.

It is an emirp because it is prime and its reverse (7023451321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231543207 - 2¹¹ = 1231541159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231543217) 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 as a sum of consecutive naturals, namely, 615771603 + 615771604.

It is an arithmetic number, because the mean of its divisors is an integer number (615771604).

Almost surely, 2^1231543207 is an apocalyptic number.

1231543207 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231543207 is an equidigital number, since it uses as much as digits as its factorization.

1231543207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 1231543207 is about 35093.3498970959. The cubic root of 1231543207 is about 1071.8891733905.

Adding to 1231543207 its reverse (7023451321), we get a palindrome (8254994528).

The spelling of 1231543207 in words is "one billion, two hundred thirty-one million, five hundred forty-three thousand, two hundred seven".