850049921 has 4 divisors (see below), whose sum is σ = 971485632. Its totient is φ = 728614212.

The previous prime is 850049899. The next prime is 850049923. The reversal of 850049921 is 129940058.

850049921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 129940058 = 2 ⋅64970029.

It is a cyclic number.

It is not a de Polignac number, because 850049921 - 2⁶ = 850049857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (850049923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60717845 + ... + 60717858.

It is an arithmetic number, because the mean of its divisors is an integer number (242871408).

Almost surely, 2^850049921 is an apocalyptic number.

It is an amenable number.

850049921 is a deficient number, since it is larger than the sum of its proper divisors (121435711).

850049921 is a wasteful number, since it uses less digits than its factorization.

850049921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121435710.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 850049921 is about 29155.6155997434. The cubic root of 850049921 is about 947.2867813631.

Adding to 850049921 its reverse (129940058), we get a palindrome (979989979).

The spelling of 850049921 in words is "eight hundred fifty million, forty-nine thousand, nine hundred twenty-one".