13123213231 has 2 divisors, whose sum is σ = 13123213232. Its totient is φ = 13123213230.

The previous prime is 13123213193. The next prime is 13123213253. The reversal of 13123213231 is 13231232131.

It is an a-pointer prime, because the next prime (13123213253) can be obtained adding 13123213231 to its sum of digits (22).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13123213231 is a prime.

It is a super-2 number, since 2×13123213231² (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 (13123213931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6561606615 + 6561606616.

It is an arithmetic number, because the mean of its divisors is an integer number (6561606616).

Almost surely, 2^13123213231 is an apocalyptic number.

13123213231 is a deficient number, since it is larger than the sum of its proper divisors (1).

13123213231 is an equidigital number, since it uses as much as digits as its factorization.

13123213231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 22.

Adding to 13123213231 its reverse (13231232131), we get a palindrome (26354445362).

The spelling of 13123213231 in words is "thirteen billion, one hundred twenty-three million, two hundred thirteen thousand, two hundred thirty-one".