209086071 has 8 divisors (see below), whose sum is σ = 278851200. Its totient is φ = 139355832.

The previous prime is 209086067. The next prime is 209086079. The reversal of 209086071 is 170680902.

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

It is not a de Polignac number, because 209086071 - 2² = 209086067 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209086079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12976 + ... + 24218.

It is an arithmetic number, because the mean of its divisors is an integer number (34856400).

Almost surely, 2^209086071 is an apocalyptic number.

209086071 is a deficient number, since it is larger than the sum of its proper divisors (69765129).

209086071 is a wasteful number, since it uses less digits than its factorization.

209086071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17445.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 209086071 is about 14459.8088161635. The cubic root of 209086071 is about 593.5286679235.

The spelling of 209086071 in words is "two hundred nine million, eighty-six thousand, seventy-one".