129984559 has 4 divisors (see below), whose sum is σ = 131324704. Its totient is φ = 128644416.

The previous prime is 129984541. The next prime is 129984577. The reversal of 129984559 is 955489921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 955489921 = 30911².

It is an interprime number because it is at equal distance from previous prime (129984541) and next prime (129984577).

It is a cyclic number.

It is not a de Polignac number, because 129984559 - 2⁹ = 129984047 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 (129984509) 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, 669927 + ... + 670120.

It is an arithmetic number, because the mean of its divisors is an integer number (32831176).

Almost surely, 2^129984559 is an apocalyptic number.

129984559 is a deficient number, since it is larger than the sum of its proper divisors (1340145).

129984559 is an equidigital number, since it uses as much as digits as its factorization.

129984559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340144.

The product of its digits is 1166400, while the sum is 52.

The square root of 129984559 is about 11401.0770982394. The cubic root of 129984559 is about 506.5596444565.

It can be divided in two parts, 1299 and 84559, that added together give a palindrome (85858).

The spelling of 129984559 in words is "one hundred twenty-nine million, nine hundred eighty-four thousand, five hundred fifty-nine".