129112549 has 4 divisors (see below), whose sum is σ = 129826060. Its totient is φ = 128399040.

The previous prime is 129112517. The next prime is 129112609. The reversal of 129112549 is 945211921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 945211921 = 109 ⋅8671669.

It can be written as a sum of positive squares in 2 ways, for example, as 3448449 + 125664100 = 1857^2 + 11210^2 .

It is a cyclic number.

It is not a de Polignac number, because 129112549 - 2⁵ = 129112517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129112849) 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, 356484 + ... + 356845.

It is an arithmetic number, because the mean of its divisors is an integer number (32456515).

Almost surely, 2^129112549 is an apocalyptic number.

It is an amenable number.

129112549 is a deficient number, since it is larger than the sum of its proper divisors (713511).

129112549 is an equidigital number, since it uses as much as digits as its factorization.

129112549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713510.

The product of its digits is 6480, while the sum is 34.

The square root of 129112549 is about 11362.7703048156. The cubic root of 129112549 is about 505.4243389567.

The spelling of 129112549 in words is "one hundred twenty-nine million, one hundred twelve thousand, five hundred forty-nine".