129999999949 has 2 divisors, whose sum is σ = 129999999950. Its totient is φ = 129999999948.

The previous prime is 129999999931. The next prime is 130000000003. The reversal of 129999999949 is 949999999921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129823296100 + 176703849 = 360310^2 + 13293^2 .

It is a cyclic number.

It is not a de Polignac number, because 129999999949 - 2¹³ = 129999991757 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129999999949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129999990949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64999999974 + 64999999975.

It is an arithmetic number, because the mean of its divisors is an integer number (64999999975).

Almost surely, 2^129999999949 is an apocalyptic number.

It is an amenable number.

129999999949 is a deficient number, since it is larger than the sum of its proper divisors (1).

129999999949 is an equidigital number, since it uses as much as digits as its factorization.

129999999949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3099363912, while the sum is 88.

The spelling of 129999999949 in words is "one hundred twenty-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred forty-nine".