129956219 has 4 divisors (see below), whose sum is σ = 136796040. Its totient is φ = 123116400.

The previous prime is 129956213. The next prime is 129956237. The reversal of 129956219 is 912659921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 912659921 = 3967 ⋅230063.

It is a cyclic number.

It is not a de Polignac number, because 129956219 - 2⁸ = 129955963 is a prime.

It is a super-2 number, since 2×129956219² = 33777237713551922, 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 129956219.

It is not an unprimeable number, because it can be changed into a prime (129956213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3419882 + ... + 3419919.

It is an arithmetic number, because the mean of its divisors is an integer number (34199010).

Almost surely, 2^129956219 is an apocalyptic number.

129956219 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

129956219 is a deficient number, since it is larger than the sum of its proper divisors (6839821).

129956219 is an equidigital number, since it uses as much as digits as its factorization.

129956219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6839820.

The product of its digits is 87480, while the sum is 44.

The square root of 129956219 is about 11399.8341654605. The cubic root of 129956219 is about 506.5228274072.

The spelling of 129956219 in words is "one hundred twenty-nine million, nine hundred fifty-six thousand, two hundred nineteen".