29985509 has 4 divisors (see below), whose sum is σ = 30021516. Its totient is φ = 29949504.

The previous prime is 29985481. The next prime is 29985517. The reversal of 29985509 is 90558992.

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

It can be written as a sum of positive squares in 2 ways, for example, as 717409 + 29268100 = 847^2 + 5410^2 .

It is a cyclic number.

It is not a de Polignac number, because 29985509 - 2⁸ = 29985253 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 (29985539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16724 + ... + 18429.

It is an arithmetic number, because the mean of its divisors is an integer number (7505379).

Almost surely, 2^29985509 is an apocalyptic number.

It is an amenable number.

29985509 is a deficient number, since it is larger than the sum of its proper divisors (36007).

29985509 is an equidigital number, since it uses as much as digits as its factorization.

29985509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36006.

The product of its (nonzero) digits is 291600, while the sum is 47.

The square root of 29985509 is about 5475.9025740055. The cubic root of 29985509 is about 310.6732126420.

The spelling of 29985509 in words is "twenty-nine million, nine hundred eighty-five thousand, five hundred nine".