131136209 has 2 divisors, whose sum is σ = 131136210. Its totient is φ = 131136208.

The previous prime is 131136191. The next prime is 131136211. The reversal of 131136209 is 902631131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131033809 + 102400 = 11447^2 + 320^2 .

It is an emirp because it is prime and its reverse (902631131) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131136209 is a prime.

It is a Sophie Germain prime.

Together with 131136211, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (131136259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65568104 + 65568105.

It is an arithmetic number, because the mean of its divisors is an integer number (65568105).

Almost surely, 2^131136209 is an apocalyptic number.

It is an amenable number.

131136209 is a deficient number, since it is larger than the sum of its proper divisors (1).

131136209 is an equidigital number, since it uses as much as digits as its factorization.

131136209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 131136209 is about 11451.4719141253. The cubic root of 131136209 is about 508.0512702196.

The spelling of 131136209 in words is "one hundred thirty-one million, one hundred thirty-six thousand, two hundred nine".