2009160721 has 8 divisors (see below), whose sum is σ = 2061189504. Its totient is φ = 1957747920.

The previous prime is 2009160697. The next prime is 2009160733. The reversal of 2009160721 is 1270619002.

It is a happy number.

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-2009160721 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2009160721.

It is not an unprimeable number, because it can be changed into a prime (2009160221) 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, 147385 + ... + 160438.

It is an arithmetic number, because the mean of its divisors is an integer number (257648688).

Almost surely, 2^2009160721 is an apocalyptic number.

It is an amenable number.

2009160721 is a deficient number, since it is larger than the sum of its proper divisors (52028783).

2009160721 is a wasteful number, since it uses less digits than its factorization.

2009160721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307991.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 2009160721 is about 44823.6625121152. The cubic root of 2009160721 is about 1261.8417512414.

Adding to 2009160721 its reverse (1270619002), we get a palindrome (3279779723).

The spelling of 2009160721 in words is "two billion, nine million, one hundred sixty thousand, seven hundred twenty-one".