13261944631109 has 2 divisors, whose sum is σ = 13261944631110. Its totient is φ = 13261944631108.

The previous prime is 13261944631097. The next prime is 13261944631163. The reversal of 13261944631109 is 90113644916231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7542658032100 + 5719286599009 = 2746390^2 + 2391503^2 .

It is a cyclic number.

It is not a de Polignac number, because 13261944631109 - 2²⁸ = 13261676195653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13261944631009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6630972315554 + 6630972315555.

It is an arithmetic number, because the mean of its divisors is an integer number (6630972315555).

Almost surely, 2^{13261944631109} is an apocalyptic number.

It is an amenable number.

13261944631109 is a deficient number, since it is larger than the sum of its proper divisors (1).

13261944631109 is an equidigital number, since it uses as much as digits as its factorization.

13261944631109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 839808, while the sum is 50.

The spelling of 13261944631109 in words is "thirteen trillion, two hundred sixty-one billion, nine hundred forty-four million, six hundred thirty-one thousand, one hundred nine".