131223001709 has 2 divisors, whose sum is σ = 131223001710. Its totient is φ = 131223001708.

The previous prime is 131223001699. The next prime is 131223001727. The reversal of 131223001709 is 907100322131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85831420900 + 45391580809 = 292970^2 + 213053^2 .

It is a cyclic number.

It is not a de Polignac number, because 131223001709 - 2⁸ = 131223001453 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131223001739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65611500854 + 65611500855.

It is an arithmetic number, because the mean of its divisors is an integer number (65611500855).

Almost surely, 2^131223001709 is an apocalyptic number.

It is an amenable number.

131223001709 is a deficient number, since it is larger than the sum of its proper divisors (1).

131223001709 is an equidigital number, since it uses as much as digits as its factorization.

131223001709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 29.

The spelling of 131223001709 in words is "one hundred thirty-one billion, two hundred twenty-three million, one thousand, seven hundred nine".