129289961 has 2 divisors, whose sum is σ = 129289962. Its totient is φ = 129289960.

The previous prime is 129289931. The next prime is 129289973. The reversal of 129289961 is 169982921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129163225 + 126736 = 11365^2 + 356^2 .

It is a cyclic number.

It is not a de Polignac number, because 129289961 - 2¹⁰ = 129288937 is a prime.

It is not a weakly prime, because it can be changed into another prime (129289921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64644980 + 64644981.

It is an arithmetic number, because the mean of its divisors is an integer number (64644981).

Almost surely, 2^129289961 is an apocalyptic number.

It is an amenable number.

129289961 is a deficient number, since it is larger than the sum of its proper divisors (1).

129289961 is an equidigital number, since it uses as much as digits as its factorization.

129289961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 47.

The square root of 129289961 is about 11370.5743478507. The cubic root of 129289961 is about 505.6557321717.

The spelling of 129289961 in words is "one hundred twenty-nine million, two hundred eighty-nine thousand, nine hundred sixty-one".