999129599 has 4 divisors (see below), whose sum is σ = 1075985736. Its totient is φ = 922273464.

The previous prime is 999129589. The next prime is 999129623. The reversal of 999129599 is 995921999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 995921999 = 17 ⋅58583647.

It is a cyclic number.

It is not a de Polignac number, because 999129599 - 2⁸ = 999129343 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 (999129569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38428049 + ... + 38428074.

It is an arithmetic number, because the mean of its divisors is an integer number (268996434).

Almost surely, 2^999129599 is an apocalyptic number.

999129599 is a deficient number, since it is larger than the sum of its proper divisors (76856137).

999129599 is a wasteful number, since it uses less digits than its factorization.

999129599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76856136.

The product of its digits is 5314410, while the sum is 62.

The square root of 999129599 is about 31609.0113575227. The cubic root of 999129599 is about 999.7097821151.

The spelling of 999129599 in words is "nine hundred ninety-nine million, one hundred twenty-nine thousand, five hundred ninety-nine".