13111220231 has 2 divisors, whose sum is σ = 13111220232. Its totient is φ = 13111220230.

The previous prime is 13111220191. The next prime is 13111220263. The reversal of 13111220231 is 13202211131.

13111220231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13111220231 - 2²² = 13107025927 is a prime.

It is a super-2 number, since 2×13111220231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13111220531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6555610115 + 6555610116.

It is an arithmetic number, because the mean of its divisors is an integer number (6555610116).

Almost surely, 2^13111220231 is an apocalyptic number.

13111220231 is a deficient number, since it is larger than the sum of its proper divisors (1).

13111220231 is an equidigital number, since it uses as much as digits as its factorization.

13111220231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 13111220231 its reverse (13202211131), we get a palindrome (26313431362).

The spelling of 13111220231 in words is "thirteen billion, one hundred eleven million, two hundred twenty thousand, two hundred thirty-one".