129879047 has 2 divisors, whose sum is σ = 129879048. Its totient is φ = 129879046.

The previous prime is 129879011. The next prime is 129879067. The reversal of 129879047 is 740978921.

It is a strong prime.

It is an emirp because it is prime and its reverse (740978921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129879047 - 2²⁴ = 113101831 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 129878992 and 129879010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129879067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64939523 + 64939524.

It is an arithmetic number, because the mean of its divisors is an integer number (64939524).

Almost surely, 2^129879047 is an apocalyptic number.

129879047 is a deficient number, since it is larger than the sum of its proper divisors (1).

129879047 is an equidigital number, since it uses as much as digits as its factorization.

129879047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 47.

The square root of 129879047 is about 11396.4488767335. The cubic root of 129879047 is about 506.4225446094.

The spelling of 129879047 in words is "one hundred twenty-nine million, eight hundred seventy-nine thousand, forty-seven".