131222209 has 2 divisors, whose sum is σ = 131222210. Its totient is φ = 131222208.

The previous prime is 131222183. The next prime is 131222237. The reversal of 131222209 is 902222131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131217025 + 5184 = 11455^2 + 72^2 .

It is a cyclic number.

It is not a de Polignac number, because 131222209 - 2⁵ = 131222177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131222209.

It is not a weakly prime, because it can be changed into another prime (131222249) 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, 65611104 + 65611105.

It is an arithmetic number, because the mean of its divisors is an integer number (65611105).

Almost surely, 2^131222209 is an apocalyptic number.

It is an amenable number.

131222209 is a deficient number, since it is larger than the sum of its proper divisors (1).

131222209 is an equidigital number, since it uses as much as digits as its factorization.

131222209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 131222209 is about 11455.2262745002. The cubic root of 131222209 is about 508.1623070867.

The spelling of 131222209 in words is "one hundred thirty-one million, two hundred twenty-two thousand, two hundred nine".