131433209 has 2 divisors, whose sum is σ = 131433210. Its totient is φ = 131433208.

The previous prime is 131433187. The next prime is 131433221. The reversal of 131433209 is 902334131.

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., 112423609 + 19009600 = 10603^2 + 4360^2 .

It is a cyclic number.

It is not a de Polignac number, because 131433209 - 2⁸ = 131432953 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (131433299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65716604 + 65716605.

It is an arithmetic number, because the mean of its divisors is an integer number (65716605).

Almost surely, 2^131433209 is an apocalyptic number.

It is an amenable number.

131433209 is a deficient number, since it is larger than the sum of its proper divisors (1).

131433209 is an equidigital number, since it uses as much as digits as its factorization.

131433209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 131433209 is about 11464.4323453017. The cubic root of 131433209 is about 508.4345293709.

The spelling of 131433209 in words is "one hundred thirty-one million, four hundred thirty-three thousand, two hundred nine".