8518621 has 4 divisors (see below), whose sum is σ = 8748892. Its totient is φ = 8288352.

The previous prime is 8518619. The next prime is 8518633. The reversal of 8518621 is 1268158.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1268158 = 2 ⋅634079.

It can be written as a sum of positive squares in 2 ways, for example, as 7896100 + 622521 = 2810^2 + 789^2 .

It is a cyclic number.

It is not a de Polignac number, because 8518621 - 2¹ = 8518619 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 (8518661) 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, 115080 + ... + 115153.

It is an arithmetic number, because the mean of its divisors is an integer number (2187223).

Almost surely, 2^8518621 is an apocalyptic number.

It is an amenable number.

8518621 is a deficient number, since it is larger than the sum of its proper divisors (230271).

8518621 is a wasteful number, since it uses less digits than its factorization.

8518621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230270.

The product of its digits is 3840, while the sum is 31.

The square root of 8518621 is about 2918.6676754985. The cubic root of 8518621 is about 204.2316748330.

The spelling of 8518621 in words is "eight million, five hundred eighteen thousand, six hundred twenty-one".