131366813 has 2 divisors, whose sum is σ = 131366814. Its totient is φ = 131366812.

The previous prime is 131366797. The next prime is 131366819. The reversal of 131366813 is 318663131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107288164 + 24078649 = 10358^2 + 4907^2 .

It is a cyclic number.

It is not a de Polignac number, because 131366813 - 2⁴ = 131366797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131366813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131366819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65683406 + 65683407.

It is an arithmetic number, because the mean of its divisors is an integer number (65683407).

Almost surely, 2^131366813 is an apocalyptic number.

It is an amenable number.

131366813 is a deficient number, since it is larger than the sum of its proper divisors (1).

131366813 is an equidigital number, since it uses as much as digits as its factorization.

131366813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 32.

The square root of 131366813 is about 11461.5362408361. The cubic root of 131366813 is about 508.3488998070.

The spelling of 131366813 in words is "one hundred thirty-one million, three hundred sixty-six thousand, eight hundred thirteen".