129391019 has 8 divisors (see below), whose sum is σ = 131559360. Its totient is φ = 127236096.

The previous prime is 129391001. The next prime is 129391027. The reversal of 129391019 is 910193921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129391019 - 2¹² = 129386923 is a prime.

It is a super-2 number, since 2×129391019² = 33484071595716722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129391019.

It is not an unprimeable number, because it can be changed into a prime (129394019) 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 in 7 ways as a sum of consecutive naturals, for example, 17117 + ... + 23489.

It is an arithmetic number, because the mean of its divisors is an integer number (16444920).

Almost surely, 2^129391019 is an apocalyptic number.

129391019 is a deficient number, since it is larger than the sum of its proper divisors (2168341).

129391019 is an equidigital number, since it uses as much as digits as its factorization.

129391019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6709.

The product of its (nonzero) digits is 4374, while the sum is 35.

The square root of 129391019 is about 11375.0173186681. The cubic root of 129391019 is about 505.7874445086.

The spelling of 129391019 in words is "one hundred twenty-nine million, three hundred ninety-one thousand, nineteen".