850921 has 4 divisors (see below), whose sum is σ = 853072. Its totient is φ = 848772.

The previous prime is 850897. The next prime is 850933. The reversal of 850921 is 129058.

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.

It is a cyclic number.

It is not a de Polignac number, because 850921 - 2¹³ = 842729 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (850951) 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, 291 + ... + 1336.

It is an arithmetic number, because the mean of its divisors is an integer number (213268).

2⁸⁵⁰⁹²¹ is an apocalyptic number.

It is an amenable number.

850921 is a deficient number, since it is larger than the sum of its proper divisors (2151).

850921 is a wasteful number, since it uses less digits than its factorization.

850921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2150.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 850921 is about 922.4537928807. The cubic root of 850921 is about 94.7610244689.

Adding to 850921 its reverse (129058), we get a palindrome (979979).

It can be divided in two parts, 850 and 921, that added together give a palindrome (1771).

The spelling of 850921 in words is "eight hundred fifty thousand, nine hundred twenty-one".