131022120209 has 2 divisors, whose sum is σ = 131022120210. Its totient is φ = 131022120208.

The previous prime is 131022120191. The next prime is 131022120221. The reversal of 131022120209 is 902021220131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82722388225 + 48299731984 = 287615^2 + 219772^2 .

It is a cyclic number.

It is not a de Polignac number, because 131022120209 - 2²⁸ = 130753684753 is a prime.

It is not a weakly prime, because it can be changed into another prime (131022120269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65511060104 + 65511060105.

It is an arithmetic number, because the mean of its divisors is an integer number (65511060105).

Almost surely, 2^131022120209 is an apocalyptic number.

It is an amenable number.

131022120209 is a deficient number, since it is larger than the sum of its proper divisors (1).

131022120209 is an equidigital number, since it uses as much as digits as its factorization.

131022120209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The spelling of 131022120209 in words is "one hundred thirty-one billion, twenty-two million, one hundred twenty thousand, two hundred nine".