847121 has 6 divisors (see below), whose sum is σ = 931266. Its totient is φ = 770000.

The previous prime is 847109. The next prime is 847129. The reversal of 847121 is 121748.

847121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 698896 + 148225 = 836^2 + 385^2 .

It is a de Polignac number, because none of the positive numbers 2^k-847121 is a prime.

It is a super-2 number, since 2×847121² = 1435227977282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (847129) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3380 + ... + 3621.

It is an arithmetic number, because the mean of its divisors is an integer number (155211).

2⁸⁴⁷¹²¹ is an apocalyptic number.

It is an amenable number.

847121 is a deficient number, since it is larger than the sum of its proper divisors (84145).

847121 is a wasteful number, since it uses less digits than its factorization.

847121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7023 (or 7012 counting only the distinct ones).

The product of its digits is 448, while the sum is 23.

The square root of 847121 is about 920.3917644134. The cubic root of 847121 is about 94.6197543026.

Adding to 847121 its reverse (121748), we get a palindrome (968869).

The spelling of 847121 in words is "eight hundred forty-seven thousand, one hundred twenty-one".