8915661 has 12 divisors (see below), whose sum is σ = 12908220. Its totient is φ = 5929920.

The previous prime is 8915639. The next prime is 8915671. The reversal of 8915661 is 1665198.

8915661 is a `hidden beast` number, since 8 + 91 + 566 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 447561 + 8468100 = 669^2 + 2910^2 .

It is not a de Polignac number, because 8915661 - 2⁶ = 8915597 is a prime.

It is a super-2 number, since 2×8915661² = 158978022133842, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8915671) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4251 + ... + 5991.

It is an arithmetic number, because the mean of its divisors is an integer number (1075685).

Almost surely, 2^8915661 is an apocalyptic number.

It is an amenable number.

8915661 is a deficient number, since it is larger than the sum of its proper divisors (3992559).

8915661 is a wasteful number, since it uses less digits than its factorization.

8915661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2316 (or 2313 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 8915661 is about 2985.9104139274. The cubic root of 8915661 is about 207.3565932234.

The spelling of 8915661 in words is "eight million, nine hundred fifteen thousand, six hundred sixty-one".