131131111 has 4 divisors (see below), whose sum is σ = 131227992. Its totient is φ = 131034232.

The previous prime is 131131097. The next prime is 131131129. The reversal of 131131111 is 111131131.

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 131131111 - 2¹³ = 131122919 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131131091 and 131131100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131111111) 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, 46381 + ... + 49126.

It is an arithmetic number, because the mean of its divisors is an integer number (32806998).

Almost surely, 2^131131111 is an apocalyptic number.

131131111 is a deficient number, since it is larger than the sum of its proper divisors (96881).

131131111 is an equidigital number, since it uses as much as digits as its factorization.

131131111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96880.

The product of its digits is 9, while the sum is 13.

The square root of 131131111 is about 11451.2493204890. The cubic root of 131131111 is about 508.0446865334.

Adding to 131131111 its reverse (111131131), we get a palindrome (242262242).

It can be divided in two parts, 131131 and 111, that multiplied together give a palindrome (14555541).

The spelling of 131131111 in words is "one hundred thirty-one million, one hundred thirty-one thousand, one hundred eleven".