129969943 has 2 divisors, whose sum is σ = 129969944. Its totient is φ = 129969942.

The previous prime is 129969923. The next prime is 129970019. The reversal of 129969943 is 349969921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129969943 - 2⁵ = 129969911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129969923) 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, 64984971 + 64984972.

It is an arithmetic number, because the mean of its divisors is an integer number (64984972).

Almost surely, 2^129969943 is an apocalyptic number.

129969943 is a deficient number, since it is larger than the sum of its proper divisors (1).

129969943 is an equidigital number, since it uses as much as digits as its factorization.

129969943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 944784, while the sum is 52.

The square root of 129969943 is about 11400.4360881503. The cubic root of 129969943 is about 506.5406571928.

The spelling of 129969943 in words is "one hundred twenty-nine million, nine hundred sixty-nine thousand, nine hundred forty-three".