131654209 has 2 divisors, whose sum is σ = 131654210. Its totient is φ = 131654208.

The previous prime is 131654197. The next prime is 131654213. The reversal of 131654209 is 902456131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128323584 + 3330625 = 11328^2 + 1825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131654209 is a prime.

It is not a weakly prime, because it can be changed into another prime (132654209) 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, 65827104 + 65827105.

It is an arithmetic number, because the mean of its divisors is an integer number (65827105).

Almost surely, 2^131654209 is an apocalyptic number.

It is an amenable number.

131654209 is a deficient number, since it is larger than the sum of its proper divisors (1).

131654209 is an equidigital number, since it uses as much as digits as its factorization.

131654209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 131654209 is about 11474.0668030128. The cubic root of 131654209 is about 508.7193409797.

The spelling of 131654209 in words is "one hundred thirty-one million, six hundred fifty-four thousand, two hundred nine".