13220313131 has 4 divisors (see below), whose sum is σ = 13222790952. Its totient is φ = 13217835312.

The previous prime is 13220313059. The next prime is 13220313179. The reversal of 13220313131 is 13131302231.

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-13220313131 is a prime.

It is a super-2 number, since 2×13220313131² (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 (13220313181) 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, 1230890 + ... + 1241583.

It is an arithmetic number, because the mean of its divisors is an integer number (3305697738).

Almost surely, 2^13220313131 is an apocalyptic number.

13220313131 is a deficient number, since it is larger than the sum of its proper divisors (2477821).

13220313131 is an equidigital number, since it uses as much as digits as its factorization.

13220313131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2477820.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 13220313131 its reverse (13131302231), we get a palindrome (26351615362).

The spelling of 13220313131 in words is "thirteen billion, two hundred twenty million, three hundred thirteen thousand, one hundred thirty-one".