131440213 has 2 divisors, whose sum is σ = 131440214. Its totient is φ = 131440212.

The previous prime is 131440187. The next prime is 131440249. The reversal of 131440213 is 312044131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131285764 + 154449 = 11458^2 + 393^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131440213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131440313) 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 as a sum of consecutive naturals, namely, 65720106 + 65720107.

It is an arithmetic number, because the mean of its divisors is an integer number (65720107).

Almost surely, 2^131440213 is an apocalyptic number.

It is an amenable number.

131440213 is a deficient number, since it is larger than the sum of its proper divisors (1).

131440213 is an equidigital number, since it uses as much as digits as its factorization.

131440213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 131440213 is about 11464.7378077303. The cubic root of 131440213 is about 508.4435606049.

Adding to 131440213 its reverse (312044131), we get a palindrome (443484344).

The spelling of 131440213 in words is "one hundred thirty-one million, four hundred forty thousand, two hundred thirteen".