13115131443 has 10 divisors (see below), whose sum is σ = 19591739684. Its totient is φ = 8743420908.

The previous prime is 13115131439. The next prime is 13115131511. The reversal of 13115131443 is 34413151131.

13115131443 is a `hidden beast` number, since 1 + 3 + 1 + 1 + 513 + 144 + 3 = 666.

It is not a de Polignac number, because 13115131443 - 2² = 13115131439 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13115131643) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 80957521 + ... + 80957682.

Almost surely, 2^13115131443 is an apocalyptic number.

13115131443 is a deficient number, since it is larger than the sum of its proper divisors (6476608241).

13115131443 is an equidigital number, since it uses as much as digits as its factorization.

13115131443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161915215 (or 161915206 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

Adding to 13115131443 its reverse (34413151131), we get a palindrome (47528282574).

The spelling of 13115131443 in words is "thirteen billion, one hundred fifteen million, one hundred thirty-one thousand, four hundred forty-three".