131531111 has 4 divisors (see below), whose sum is σ = 131835312. Its totient is φ = 131226912.

The previous prime is 131531093. The next prime is 131531143. The reversal of 131531111 is 111135131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111135131 = 97 ⋅1145723.

It is a cyclic number.

It is not a de Polignac number, because 131531111 - 2¹⁴ = 131514727 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131531111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131531161) 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, 151451 + ... + 152316.

It is an arithmetic number, because the mean of its divisors is an integer number (32958828).

Almost surely, 2^131531111 is an apocalyptic number.

131531111 is a deficient number, since it is larger than the sum of its proper divisors (304201).

131531111 is an equidigital number, since it uses as much as digits as its factorization.

131531111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304200.

The product of its digits is 45, while the sum is 17.

The square root of 131531111 is about 11468.7013650195. The cubic root of 131531111 is about 508.5607389835.

Adding to 131531111 its reverse (111135131), we get a palindrome (242666242).

The spelling of 131531111 in words is "one hundred thirty-one million, five hundred thirty-one thousand, one hundred eleven".