129284819 has 2 divisors, whose sum is σ = 129284820. Its totient is φ = 129284818.

The previous prime is 129284809. The next prime is 129284821. The reversal of 129284819 is 918482921.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129284819 is a prime.

It is a super-2 number, since 2×129284819² = 33429128847725522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 129284821, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129284819.

It is not a weakly prime, because it can be changed into another prime (129284809) 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, 64642409 + 64642410.

It is an arithmetic number, because the mean of its divisors is an integer number (64642410).

Almost surely, 2^129284819 is an apocalyptic number.

129284819 is a deficient number, since it is larger than the sum of its proper divisors (1).

129284819 is an equidigital number, since it uses as much as digits as its factorization.

129284819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 44.

The square root of 129284819 is about 11370.3482356522. The cubic root of 129284819 is about 505.6490285931.

The spelling of 129284819 in words is "one hundred twenty-nine million, two hundred eighty-four thousand, eight hundred nineteen".