129147549 has 4 divisors (see below), whose sum is σ = 172196736. Its totient is φ = 86098364.

The previous prime is 129147547. The next prime is 129147559. The reversal of 129147549 is 945741921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 129147549 - 2¹ = 129147547 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 129147549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129147547) 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, 21524589 + ... + 21524594.

It is an arithmetic number, because the mean of its divisors is an integer number (43049184).

Almost surely, 2^129147549 is an apocalyptic number.

It is an amenable number.

129147549 is a deficient number, since it is larger than the sum of its proper divisors (43049187).

129147549 is an equidigital number, since it uses as much as digits as its factorization.

129147549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43049186.

The product of its digits is 90720, while the sum is 42.

The square root of 129147549 is about 11364.3103178328. The cubic root of 129147549 is about 505.4700051959.

The spelling of 129147549 in words is "one hundred twenty-nine million, one hundred forty-seven thousand, five hundred forty-nine".