13123133531 has 2 divisors, whose sum is σ = 13123133532. Its totient is φ = 13123133530.

The previous prime is 13123133521. The next prime is 13123133533. The reversal of 13123133531 is 13533132131.

It is a strong prime.

It is an emirp because it is prime and its reverse (13533132131) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13123133531 is a prime.

It is a super-2 number, since 2×13123133531² (a number of 21 digits) contains 22 as substring.

Together with 13123133533, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13123133531.

It is not a weakly prime, because it can be changed into another prime (13123133533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6561566765 + 6561566766.

It is an arithmetic number, because the mean of its divisors is an integer number (6561566766).

Almost surely, 2^13123133531 is an apocalyptic number.

13123133531 is a deficient number, since it is larger than the sum of its proper divisors (1).

13123133531 is an equidigital number, since it uses as much as digits as its factorization.

13123133531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2430, while the sum is 26.

Adding to 13123133531 its reverse (13533132131), we get a palindrome (26656265662).

The spelling of 13123133531 in words is "thirteen billion, one hundred twenty-three million, one hundred thirty-three thousand, five hundred thirty-one".