129124219 has 4 divisors (see below), whose sum is σ = 147570544. Its totient is φ = 110677896.

The previous prime is 129124217. The next prime is 129124243. The reversal of 129124219 is 912421921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 912421921 = 1367 ⋅667463.

It is not a de Polignac number, because 129124219 - 2¹ = 129124217 is a prime.

It is a super-2 number, since 2×129124219² = 33346127864719922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129124217) 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 3 ways as a sum of consecutive naturals, for example, 9223152 + ... + 9223165.

It is an arithmetic number, because the mean of its divisors is an integer number (36892636).

Almost surely, 2^129124219 is an apocalyptic number.

129124219 is a deficient number, since it is larger than the sum of its proper divisors (18446325).

129124219 is an equidigital number, since it uses as much as digits as its factorization.

129124219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18446324.

The product of its digits is 2592, while the sum is 31.

The square root of 129124219 is about 11363.2838123493. The cubic root of 129124219 is about 505.4395663026.

The spelling of 129124219 in words is "one hundred twenty-nine million, one hundred twenty-four thousand, two hundred nineteen".