131338609 has 2 divisors, whose sum is σ = 131338610. Its totient is φ = 131338608.

The previous prime is 131338589. The next prime is 131338637. The reversal of 131338609 is 906833131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76947984 + 54390625 = 8772^2 + 7375^2 .

It is a cyclic number.

It is not a de Polignac number, because 131338609 - 2⁵ = 131338577 is a prime.

It is not a weakly prime, because it can be changed into another prime (131338639) 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, 65669304 + 65669305.

It is an arithmetic number, because the mean of its divisors is an integer number (65669305).

Almost surely, 2^131338609 is an apocalyptic number.

It is an amenable number.

131338609 is a deficient number, since it is larger than the sum of its proper divisors (1).

131338609 is an equidigital number, since it uses as much as digits as its factorization.

131338609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 131338609 is about 11460.3057987124. The cubic root of 131338609 is about 508.3125169534.

The spelling of 131338609 in words is "one hundred thirty-one million, three hundred thirty-eight thousand, six hundred nine".