129418819 has 2 divisors, whose sum is σ = 129418820. Its totient is φ = 129418818.

The previous prime is 129418813. The next prime is 129418843. The reversal of 129418819 is 918814921.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129418819 - 2³ = 129418811 is a prime.

It is a super-2 number, since 2×129418819² = 33498461422709522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (129418811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64709409 + 64709410.

It is an arithmetic number, because the mean of its divisors is an integer number (64709410).

Almost surely, 2^129418819 is an apocalyptic number.

129418819 is a deficient number, since it is larger than the sum of its proper divisors (1).

129418819 is an equidigital number, since it uses as much as digits as its factorization.

129418819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 43.

The square root of 129418819 is about 11376.2392292005. The cubic root of 129418819 is about 505.8236651680.

The spelling of 129418819 in words is "one hundred twenty-nine million, four hundred eighteen thousand, eight hundred nineteen".