131111213 has 4 divisors (see below), whose sum is σ = 131363388. Its totient is φ = 130859040.

The previous prime is 131111207. The next prime is 131111221. The reversal of 131111213 is 312111131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12802084 + 118309129 = 3578^2 + 10877^2 .

It is a cyclic number.

It is not a de Polignac number, because 131111213 - 2²⁰ = 130062637 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 (131111243) 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, 125306 + ... + 126347.

It is an arithmetic number, because the mean of its divisors is an integer number (32840847).

Almost surely, 2^131111213 is an apocalyptic number.

It is an amenable number.

131111213 is a deficient number, since it is larger than the sum of its proper divisors (252175).

131111213 is an equidigital number, since it uses as much as digits as its factorization.

131111213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252174.

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

The square root of 131111213 is about 11450.3804740279. The cubic root of 131111213 is about 508.0189881199.

Adding to 131111213 its reverse (312111131), we get a palindrome (443222344).

The spelling of 131111213 in words is "one hundred thirty-one million, one hundred eleven thousand, two hundred thirteen".