609797721 has 16 divisors (see below), whose sum is σ = 879253760. Its totient is φ = 373697280.

The previous prime is 609797719. The next prime is 609797729. The reversal of 609797721 is 127797906.

It is not a de Polignac number, because 609797721 - 2¹ = 609797719 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (609797729) 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 15 ways as a sum of consecutive naturals, for example, 23041 + ... + 41838.

It is an arithmetic number, because the mean of its divisors is an integer number (54953360).

Almost surely, 2^609797721 is an apocalyptic number.

It is an amenable number.

609797721 is a deficient number, since it is larger than the sum of its proper divisors (269456039).

609797721 is a wasteful number, since it uses less digits than its factorization.

609797721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65136.

The product of its (nonzero) digits is 333396, while the sum is 48.

The square root of 609797721 is about 24694.0827122613. The cubic root of 609797721 is about 847.9988545916.

The spelling of 609797721 in words is "six hundred nine million, seven hundred ninety-seven thousand, seven hundred twenty-one".