2009216705 has 8 divisors (see below), whose sum is σ = 2411527272. Its totient is φ = 1607061888.

The previous prime is 2009216687. The next prime is 2009216707. The reversal of 2009216705 is 5076129002.

It can be written as a sum of positive squares in 4 ways, for example, as 1167520561 + 841696144 = 34169^2 + 29012^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2009216705 is a prime.

It is a super-3 number, since 3×2009216705³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2009216707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8372 + ... + 63941.

It is an arithmetic number, because the mean of its divisors is an integer number (301440909).

Almost surely, 2^2009216705 is an apocalyptic number.

It is an amenable number.

2009216705 is a deficient number, since it is larger than the sum of its proper divisors (402310567).

2009216705 is an equidigital number, since it uses as much as digits as its factorization.

2009216705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77875.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 2009216705 is about 44824.2869993489. The cubic root of 2009216705 is about 1261.8534712749.

The spelling of 2009216705 in words is "two billion, nine million, two hundred sixteen thousand, seven hundred five".