13111643 has 2 divisors, whose sum is σ = 13111644. Its totient is φ = 13111642.

The previous prime is 13111639. The next prime is 13111649. The reversal of 13111643 is 34611131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13111643 - 2² = 13111639 is a prime.

It is not a weakly prime, because it can be changed into another prime (13111649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6555821 + 6555822.

It is an arithmetic number, because the mean of its divisors is an integer number (6555822).

Almost surely, 2^13111643 is an apocalyptic number.

13111643 is a deficient number, since it is larger than the sum of its proper divisors (1).

13111643 is an equidigital number, since it uses as much as digits as its factorization.

13111643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 20.

The square root of 13111643 is about 3621.0002761668. Note that the first 3 decimals coincide. The cubic root of 13111643 is about 235.8046537757.

Adding to 13111643 its reverse (34611131), we get a palindrome (47722774).

The spelling of 13111643 in words is "thirteen million, one hundred eleven thousand, six hundred forty-three".