8851921 has 4 divisors (see below), whose sum is σ = 9532852. Its totient is φ = 8170992.

The previous prime is 8851919. The next prime is 8851939. The reversal of 8851921 is 1291588.

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 1234321 + 7617600 = 1111^2 + 2760^2 .

It is a cyclic number.

It is not a de Polignac number, because 8851921 - 2¹ = 8851919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8851961) 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, 340446 + ... + 340471.

It is an arithmetic number, because the mean of its divisors is an integer number (2383213).

Almost surely, 2^8851921 is an apocalyptic number.

It is an amenable number.

8851921 is a deficient number, since it is larger than the sum of its proper divisors (680931).

8851921 is a wasteful number, since it uses less digits than its factorization.

8851921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680930.

The product of its digits is 5760, while the sum is 34.

The square root of 8851921 is about 2975.2178071529. The cubic root of 8851921 is about 206.8612651408.

It can be divided in two parts, 8 and 851921, that added together give a square (851929 = 923²).

The spelling of 8851921 in words is "eight million, eight hundred fifty-one thousand, nine hundred twenty-one".