131288609 has 2 divisors, whose sum is σ = 131288610. Its totient is φ = 131288608.

The previous prime is 131288557. The next prime is 131288659. The reversal of 131288609 is 906882131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127690000 + 3598609 = 11300^2 + 1897^2 .

It is a cyclic number.

It is not a de Polignac number, because 131288609 - 2²⁴ = 114511393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (131288659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65644304 + 65644305.

It is an arithmetic number, because the mean of its divisors is an integer number (65644305).

Almost surely, 2^131288609 is an apocalyptic number.

It is an amenable number.

131288609 is a deficient number, since it is larger than the sum of its proper divisors (1).

131288609 is an equidigital number, since it uses as much as digits as its factorization.

131288609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 131288609 is about 11458.1241483936. The cubic root of 131288609 is about 508.2480046928.

The spelling of 131288609 in words is "one hundred thirty-one million, two hundred eighty-eight thousand, six hundred nine".