129931847 has 2 divisors, whose sum is σ = 129931848. Its totient is φ = 129931846.

The previous prime is 129931843. The next prime is 129931859. The reversal of 129931847 is 748139921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129931847 - 2² = 129931843 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 129931798 and 129931807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129931843) 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, 64965923 + 64965924.

It is an arithmetic number, because the mean of its divisors is an integer number (64965924).

Almost surely, 2^129931847 is an apocalyptic number.

129931847 is a deficient number, since it is larger than the sum of its proper divisors (1).

129931847 is an equidigital number, since it uses as much as digits as its factorization.

129931847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 129931847 is about 11398.7651524189. The cubic root of 129931847 is about 506.4911609833.

The spelling of 129931847 in words is "one hundred twenty-nine million, nine hundred thirty-one thousand, eight hundred forty-seven".