129631297 has 2 divisors, whose sum is σ = 129631298. Its totient is φ = 129631296.

The previous prime is 129631279. The next prime is 129631343. The reversal of 129631297 is 792136921.

Together with previous prime (129631279) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121198081 + 8433216 = 11009^2 + 2904^2 .

It is a cyclic number.

It is not a de Polignac number, because 129631297 - 2⁷ = 129631169 is a prime.

It is not a weakly prime, because it can be changed into another prime (129631207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64815648 + 64815649.

It is an arithmetic number, because the mean of its divisors is an integer number (64815649).

Almost surely, 2^129631297 is an apocalyptic number.

It is an amenable number.

129631297 is a deficient number, since it is larger than the sum of its proper divisors (1).

129631297 is an equidigital number, since it uses as much as digits as its factorization.

129631297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 40.

The square root of 129631297 is about 11385.5740742397. The cubic root of 129631297 is about 506.1003318779.

The spelling of 129631297 in words is "one hundred twenty-nine million, six hundred thirty-one thousand, two hundred ninety-seven".