129999113861 has 2 divisors, whose sum is σ = 129999113862. Its totient is φ = 129999113860.

The previous prime is 129999113843. The next prime is 129999113869. The reversal of 129999113861 is 168311999921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129946551361 + 52562500 = 360481^2 + 7250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129999113861 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129999113861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129999113869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64999556930 + 64999556931.

It is an arithmetic number, because the mean of its divisors is an integer number (64999556931).

Almost surely, 2^129999113861 is an apocalyptic number.

It is an amenable number.

129999113861 is a deficient number, since it is larger than the sum of its proper divisors (1).

129999113861 is an equidigital number, since it uses as much as digits as its factorization.

129999113861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1889568, while the sum is 59.

The spelling of 129999113861 in words is "one hundred twenty-nine billion, nine hundred ninety-nine million, one hundred thirteen thousand, eight hundred sixty-one".