13131355123 has 4 divisors (see below), whose sum is σ = 13209986160. Its totient is φ = 13052724088.

The previous prime is 13131355103. The next prime is 13131355129. The reversal of 13131355123 is 32155313131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13131355123 - 2²⁵ = 13097800691 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13131355091 and 13131355100.

It is not an unprimeable number, because it can be changed into a prime (13131355129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39315268 + ... + 39315601.

It is an arithmetic number, because the mean of its divisors is an integer number (3302496540).

Almost surely, 2^13131355123 is an apocalyptic number.

13131355123 is a deficient number, since it is larger than the sum of its proper divisors (78631037).

13131355123 is an equidigital number, since it uses as much as digits as its factorization.

13131355123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78631036.

The product of its digits is 4050, while the sum is 28.

Adding to 13131355123 its reverse (32155313131), we get a palindrome (45286668254).

The spelling of 13131355123 in words is "thirteen billion, one hundred thirty-one million, three hundred fifty-five thousand, one hundred twenty-three".