129806947 has 2 divisors, whose sum is σ = 129806948. Its totient is φ = 129806946.

The previous prime is 129806933. The next prime is 129806953. The reversal of 129806947 is 749608921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129806947 - 2⁷ = 129806819 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 129806897 and 129806906.

It is not a weakly prime, because it can be changed into another prime (129806927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64903473 + 64903474.

It is an arithmetic number, because the mean of its divisors is an integer number (64903474).

Almost surely, 2^129806947 is an apocalyptic number.

129806947 is a deficient number, since it is larger than the sum of its proper divisors (1).

129806947 is an equidigital number, since it uses as much as digits as its factorization.

129806947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 129806947 is about 11393.2851715385. The cubic root of 129806947 is about 506.3288168298.

The spelling of 129806947 in words is "one hundred twenty-nine million, eight hundred six thousand, nine hundred forty-seven".