13131321131 has 4 divisors (see below), whose sum is σ = 13174094472. Its totient is φ = 13088547792.

The previous prime is 13131321109. The next prime is 13131321139. The reversal of 13131321131 is 13112313131.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13131321131 is a prime.

It is a super-2 number, since 2×13131321131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13131321139) 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, 21386210 + ... + 21386823.

It is an arithmetic number, because the mean of its divisors is an integer number (3293523618).

Almost surely, 2^13131321131 is an apocalyptic number.

13131321131 is a deficient number, since it is larger than the sum of its proper divisors (42773341).

13131321131 is an equidigital number, since it uses as much as digits as its factorization.

13131321131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42773340.

The product of its digits is 162, while the sum is 20.

Adding to 13131321131 its reverse (13112313131), we get a palindrome (26243634262).

The spelling of 13131321131 in words is "thirteen billion, one hundred thirty-one million, three hundred twenty-one thousand, one hundred thirty-one".