131321111 has 4 divisors (see below), whose sum is σ = 132046824. Its totient is φ = 130595400.

The previous prime is 131321101. The next prime is 131321131. The reversal of 131321111 is 111123131.

It is a happy number.

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-131321111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131321101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362585 + ... + 362946.

It is an arithmetic number, because the mean of its divisors is an integer number (33011706).

Almost surely, 2^131321111 is an apocalyptic number.

131321111 is a deficient number, since it is larger than the sum of its proper divisors (725713).

131321111 is an equidigital number, since it uses as much as digits as its factorization.

131321111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725712.

The product of its digits is 18, while the sum is 14.

The square root of 131321111 is about 11459.5423556091. The cubic root of 131321111 is about 508.2899421053.

Adding to 131321111 its reverse (111123131), we get a palindrome (242444242).

The spelling of 131321111 in words is "one hundred thirty-one million, three hundred twenty-one thousand, one hundred eleven".