129637961 has 2 divisors, whose sum is σ = 129637962. Its totient is φ = 129637960.

The previous prime is 129637943. The next prime is 129637987. The reversal of 129637961 is 169736921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74046025 + 55591936 = 8605^2 + 7456^2 .

It is a cyclic number.

It is not a de Polignac number, because 129637961 - 2¹⁸ = 129375817 is a prime.

It is not a weakly prime, because it can be changed into another prime (129637901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64818980 + 64818981.

It is an arithmetic number, because the mean of its divisors is an integer number (64818981).

Almost surely, 2^129637961 is an apocalyptic number.

It is an amenable number.

129637961 is a deficient number, since it is larger than the sum of its proper divisors (1).

129637961 is an equidigital number, since it uses as much as digits as its factorization.

129637961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 44.

The square root of 129637961 is about 11385.8667215105. The cubic root of 129637961 is about 506.1090041530.

The spelling of 129637961 in words is "one hundred twenty-nine million, six hundred thirty-seven thousand, nine hundred sixty-one".