13123031111 has 2 divisors, whose sum is σ = 13123031112. Its totient is φ = 13123031110.

The previous prime is 13123031071. The next prime is 13123031123. The reversal of 13123031111 is 11113032131.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13123031111 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13123031111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13123031161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6561515555 + 6561515556.

It is an arithmetic number, because the mean of its divisors is an integer number (6561515556).

Almost surely, 2^13123031111 is an apocalyptic number.

13123031111 is a deficient number, since it is larger than the sum of its proper divisors (1).

13123031111 is an equidigital number, since it uses as much as digits as its factorization.

13123031111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 17.

Adding to 13123031111 its reverse (11113032131), we get a palindrome (24236063242).

The spelling of 13123031111 in words is "thirteen billion, one hundred twenty-three million, thirty-one thousand, one hundred eleven".