131131213 has 4 divisors (see below), whose sum is σ = 131215840. Its totient is φ = 131046588.

The previous prime is 131131199. The next prime is 131131279. The reversal of 131131213 is 312131131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 312131131 = 13 ⋅24010087.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131131213 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 (131131613) 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, 39945 + ... + 43102.

It is an arithmetic number, because the mean of its divisors is an integer number (32803960).

Almost surely, 2^131131213 is an apocalyptic number.

It is an amenable number.

131131213 is a deficient number, since it is larger than the sum of its proper divisors (84627).

131131213 is an equidigital number, since it uses as much as digits as its factorization.

131131213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84626.

The product of its digits is 54, while the sum is 16.

The square root of 131131213 is about 11451.2537741507. The cubic root of 131131213 is about 508.0448182604.

Adding to 131131213 its reverse (312131131), we get a palindrome (443262344).

The spelling of 131131213 in words is "one hundred thirty-one million, one hundred thirty-one thousand, two hundred thirteen".