209929085 has 8 divisors (see below), whose sum is σ = 252206136. Its totient is φ = 167749120.

The previous prime is 209929067. The next prime is 209929091. The reversal of 209929085 is 580929902.

209929085 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 15856324 + 194072761 = 3982^2 + 13931^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 209929085 - 2²⁴ = 193151869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19424 + ... + 28233.

It is an arithmetic number, because the mean of its divisors is an integer number (31525767).

Almost surely, 2^209929085 is an apocalyptic number.

It is an amenable number.

209929085 is a deficient number, since it is larger than the sum of its proper divisors (42277051).

209929085 is an equidigital number, since it uses as much as digits as its factorization.

209929085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48543.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 209929085 is about 14488.9297396323. The cubic root of 209929085 is about 594.3252808825.

The spelling of 209929085 in words is "two hundred nine million, nine hundred twenty-nine thousand, eighty-five".