131240609 has 2 divisors, whose sum is σ = 131240610. Its totient is φ = 131240608.

The previous prime is 131240569. The next prime is 131240617. The reversal of 131240609 is 906042131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129322384 + 1918225 = 11372^2 + 1385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131240609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (131240209) 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, 65620304 + 65620305.

It is an arithmetic number, because the mean of its divisors is an integer number (65620305).

Almost surely, 2^131240609 is an apocalyptic number.

It is an amenable number.

131240609 is a deficient number, since it is larger than the sum of its proper divisors (1).

131240609 is an equidigital number, since it uses as much as digits as its factorization.

131240609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 131240609 is about 11456.0293732165. The cubic root of 131240609 is about 508.1860575111.

The spelling of 131240609 in words is "one hundred thirty-one million, two hundred forty thousand, six hundred nine".