131205323 has 2 divisors, whose sum is σ = 131205324. Its totient is φ = 131205322.

The previous prime is 131205307. The next prime is 131205359. The reversal of 131205323 is 323502131.

It is a weak prime.

It is an emirp because it is prime and its reverse (323502131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131205323 - 2⁴ = 131205307 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131205295 and 131205304.

It is not a weakly prime, because it can be changed into another prime (131205923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65602661 + 65602662.

It is an arithmetic number, because the mean of its divisors is an integer number (65602662).

Almost surely, 2^131205323 is an apocalyptic number.

131205323 is a deficient number, since it is larger than the sum of its proper divisors (1).

131205323 is an equidigital number, since it uses as much as digits as its factorization.

131205323 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 131205323 is about 11454.4892072934. The cubic root of 131205323 is about 508.1405089555.

Adding to 131205323 its reverse (323502131), we get a palindrome (454707454).

The spelling of 131205323 in words is "one hundred thirty-one million, two hundred five thousand, three hundred twenty-three".