129306999 has 4 divisors (see below), whose sum is σ = 172409336. Its totient is φ = 86204664.

The previous prime is 129306997. The next prime is 129307001. The reversal of 129306999 is 999603921.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (129306997) and next prime (129307001).

It is not a de Polignac number, because 129306999 - 2¹ = 129306997 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 (129306997) 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, 21551164 + ... + 21551169.

It is an arithmetic number, because the mean of its divisors is an integer number (43102334).

Almost surely, 2^129306999 is an apocalyptic number.

129306999 is a deficient number, since it is larger than the sum of its proper divisors (43102337).

129306999 is an equidigital number, since it uses as much as digits as its factorization.

129306999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43102336.

The product of its (nonzero) digits is 236196, while the sum is 48.

The square root of 129306999 is about 11371.3235377418. The cubic root of 129306999 is about 505.6779431871.

It can be divided in two parts, 129306 and 999, that added together give a triangular number (130305 = T₅₁₀).

The spelling of 129306999 in words is "one hundred twenty-nine million, three hundred six thousand, nine hundred ninety-nine".