131220111331 has 4 divisors (see below), whose sum is σ = 138126433000. Its totient is φ = 124313789664.

The previous prime is 131220111329. The next prime is 131220111353. The reversal of 131220111331 is 133111022131.

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 131220111331 - 2¹ = 131220111329 is a prime.

It is a super-2 number, since 2×131220111331² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 6906321649 = 131220111331 / (1 + 3 + 1 + 2 + 2 + 0 + 1 + 1 + 1 + 3 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131220111299 and 131220111308.

It is not an unprimeable number, because it can be changed into a prime (131220111311) 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, 3453160806 + ... + 3453160843.

It is an arithmetic number, because the mean of its divisors is an integer number (34531608250).

Almost surely, 2^131220111331 is an apocalyptic number.

131220111331 is a deficient number, since it is larger than the sum of its proper divisors (6906321669).

131220111331 is an equidigital number, since it uses as much as digits as its factorization.

131220111331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6906321668.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 131220111331 its reverse (133111022131), we get a palindrome (264331133462).

The spelling of 131220111331 in words is "one hundred thirty-one billion, two hundred twenty million, one hundred eleven thousand, three hundred thirty-one".