131210213209 has 2 divisors, whose sum is σ = 131210213210. Its totient is φ = 131210213208.

The previous prime is 131210213203. The next prime is 131210213237. The reversal of 131210213209 is 902312012131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96326433225 + 34883779984 = 310365^2 + 186772^2 .

It is a cyclic number.

It is not a de Polignac number, because 131210213209 - 2⁷ = 131210213081 is a prime.

It is a super-2 number, since 2×131210213209² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (131210213203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65605106604 + 65605106605.

It is an arithmetic number, because the mean of its divisors is an integer number (65605106605).

Almost surely, 2^131210213209 is an apocalyptic number.

It is an amenable number.

131210213209 is a deficient number, since it is larger than the sum of its proper divisors (1).

131210213209 is an equidigital number, since it uses as much as digits as its factorization.

131210213209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 25.

The spelling of 131210213209 in words is "one hundred thirty-one billion, two hundred ten million, two hundred thirteen thousand, two hundred nine".