850511721 has 8 divisors (see below), whose sum is σ = 1135386880. Its totient is φ = 566322192.

The previous prime is 850511719. The next prime is 850511729. The reversal of 850511721 is 127115058.

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

It is not a de Polignac number, because 850511721 - 2¹ = 850511719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (850511729) 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, 168505 + ... + 173478.

It is an arithmetic number, because the mean of its divisors is an integer number (141923360).

Almost surely, 2^850511721 is an apocalyptic number.

It is an amenable number.

850511721 is a deficient number, since it is larger than the sum of its proper divisors (284875159).

850511721 is a wasteful number, since it uses less digits than its factorization.

850511721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342815.

The product of its (nonzero) digits is 2800, while the sum is 30.

The square root of 850511721 is about 29163.5340965391. The cubic root of 850511721 is about 947.4582920124.

Adding to 850511721 its reverse (127115058), we get a palindrome (977626779).

The spelling of 850511721 in words is "eight hundred fifty million, five hundred eleven thousand, seven hundred twenty-one".