8618521 has 8 divisors (see below), whose sum is σ = 8936840. Its totient is φ = 8304768.

The previous prime is 8618501. The next prime is 8618557. The reversal of 8618521 is 1258168.

It can be written as a sum of positive squares in 4 ways, for example, as 1537600 + 7080921 = 1240^2 + 2661^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8618521 - 2²¹ = 6521369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8618501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2965 + ... + 5101.

It is an arithmetic number, because the mean of its divisors is an integer number (1117105).

Almost surely, 2^8618521 is an apocalyptic number.

It is an amenable number.

8618521 is a deficient number, since it is larger than the sum of its proper divisors (318319).

8618521 is a wasteful number, since it uses less digits than its factorization.

8618521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2283.

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

The square root of 8618521 is about 2935.7317656761. The cubic root of 8618521 is about 205.0269328088.

The spelling of 8618521 in words is "eight million, six hundred eighteen thousand, five hundred twenty-one".