131859209 has 2 divisors, whose sum is σ = 131859210. Its totient is φ = 131859208.

The previous prime is 131859197. The next prime is 131859251. The reversal of 131859209 is 902958131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96098809 + 35760400 = 9803^2 + 5980^2 .

It is an emirp because it is prime and its reverse (902958131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131859209 - 2⁴ = 131859193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (131859109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65929604 + 65929605.

It is an arithmetic number, because the mean of its divisors is an integer number (65929605).

Almost surely, 2^131859209 is an apocalyptic number.

It is an amenable number.

131859209 is a deficient number, since it is larger than the sum of its proper divisors (1).

131859209 is an equidigital number, since it uses as much as digits as its factorization.

131859209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 131859209 is about 11482.9965165892. The cubic root of 131859209 is about 508.9832479308.

The spelling of 131859209 in words is "one hundred thirty-one million, eight hundred fifty-nine thousand, two hundred nine".