131781944677 has 2 divisors, whose sum is σ = 131781944678. Its totient is φ = 131781944676.

The previous prime is 131781944669. The next prime is 131781944719. The reversal of 131781944677 is 776449187131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126034940196 + 5747004481 = 355014^2 + 75809^2 .

It is a cyclic number.

It is not a de Polignac number, because 131781944677 - 2³ = 131781944669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131781948677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65890972338 + 65890972339.

It is an arithmetic number, because the mean of its divisors is an integer number (65890972339).

Almost surely, 2^131781944677 is an apocalyptic number.

It is an amenable number.

131781944677 is a deficient number, since it is larger than the sum of its proper divisors (1).

131781944677 is an equidigital number, since it uses as much as digits as its factorization.

131781944677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7112448, while the sum is 58.

The spelling of 131781944677 in words is "one hundred thirty-one billion, seven hundred eighty-one million, nine hundred forty-four thousand, six hundred seventy-seven".