129552919 has 4 divisors (see below), whose sum is σ = 131377680. Its totient is φ = 127728160.

The previous prime is 129552911. The next prime is 129552923. The reversal of 129552919 is 919255921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 919255921 = 7603 ⋅120907.

It is a cyclic number.

It is not a de Polignac number, because 129552919 - 2³ = 129552911 is a prime.

It is a super-2 number, since 2×129552919² = 33567917642841122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129552911) 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, 912274 + ... + 912415.

It is an arithmetic number, because the mean of its divisors is an integer number (32844420).

Almost surely, 2^129552919 is an apocalyptic number.

129552919 is a deficient number, since it is larger than the sum of its proper divisors (1824761).

129552919 is an equidigital number, since it uses as much as digits as its factorization.

129552919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824760.

The product of its digits is 72900, while the sum is 43.

The square root of 129552919 is about 11382.1315666267. The cubic root of 129552919 is about 505.9983114297.

The spelling of 129552919 in words is "one hundred twenty-nine million, five hundred fifty-two thousand, nine hundred nineteen".