850289821 has 4 divisors (see below), whose sum is σ = 851123644. Its totient is φ = 849456000.

The previous prime is 850289819. The next prime is 850289837. The reversal of 850289821 is 128982058.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 642064921 + 208224900 = 25339^2 + 14430^2 .

It is a cyclic number.

It is not a de Polignac number, because 850289821 - 2¹ = 850289819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (850286821) 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, 415380 + ... + 417421.

It is an arithmetic number, because the mean of its divisors is an integer number (212780911).

Almost surely, 2^850289821 is an apocalyptic number.

It is an amenable number.

850289821 is a deficient number, since it is larger than the sum of its proper divisors (833823).

850289821 is a wasteful number, since it uses less digits than its factorization.

850289821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833822.

The product of its (nonzero) digits is 92160, while the sum is 43.

The square root of 850289821 is about 29159.7294397599. The cubic root of 850289821 is about 947.3758870020.

It can be divided in two parts, 85028 and 9821, that added together give a palindrome (94849).

The spelling of 850289821 in words is "eight hundred fifty million, two hundred eighty-nine thousand, eight hundred twenty-one".