13231811 has 2 divisors, whose sum is σ = 13231812. Its totient is φ = 13231810.

The previous prime is 13231787. The next prime is 13231819. The reversal of 13231811 is 11813231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13231811 - 2¹⁰ = 13230787 is a prime.

It is not a weakly prime, because it can be changed into another prime (13231819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6615905 + 6615906.

It is an arithmetic number, because the mean of its divisors is an integer number (6615906).

Almost surely, 2^13231811 is an apocalyptic number.

13231811 is a deficient number, since it is larger than the sum of its proper divisors (1).

13231811 is an equidigital number, since it uses as much as digits as its factorization.

13231811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 20.

The square root of 13231811 is about 3637.5556353134. Note that the first 3 decimals coincide. The cubic root of 13231811 is about 236.5228461199.

The spelling of 13231811 in words is "thirteen million, two hundred thirty-one thousand, eight hundred eleven".