13123811 has 2 divisors, whose sum is σ = 13123812. Its totient is φ = 13123810.

The previous prime is 13123769. The next prime is 13123841. The reversal of 13123811 is 11832131.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13123811 is a prime.

It is not a weakly prime, because it can be changed into another prime (13123841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6561905 + 6561906.

It is an arithmetic number, because the mean of its divisors is an integer number (6561906).

Almost surely, 2^13123811 is an apocalyptic number.

13123811 is a deficient number, since it is larger than the sum of its proper divisors (1).

13123811 is an equidigital number, since it uses as much as digits as its factorization.

13123811 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 13123811 is about 3622.6800852408. The cubic root of 13123811 is about 235.8775758317.

Adding to 13123811 its reverse (11832131), we get a palindrome (24955942).

The spelling of 13123811 in words is "thirteen million, one hundred twenty-three thousand, eight hundred eleven".