129663761 has 2 divisors, whose sum is σ = 129663762. Its totient is φ = 129663760.

The previous prime is 129663739. The next prime is 129663763. The reversal of 129663761 is 167366921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129254161 + 409600 = 11369^2 + 640^2 .

It is a cyclic number.

It is not a de Polignac number, because 129663761 - 2⁶ = 129663697 is a prime.

Together with 129663763, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129663763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64831880 + 64831881.

It is an arithmetic number, because the mean of its divisors is an integer number (64831881).

Almost surely, 2^129663761 is an apocalyptic number.

It is an amenable number.

129663761 is a deficient number, since it is larger than the sum of its proper divisors (1).

129663761 is an equidigital number, since it uses as much as digits as its factorization.

129663761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 41.

The square root of 129663761 is about 11386.9996487222. Note that the first 3 decimals coincide. The cubic root of 129663761 is about 506.1425764855.

The spelling of 129663761 in words is "one hundred twenty-nine million, six hundred sixty-three thousand, seven hundred sixty-one".