8649261 has 10 divisors (see below), whose sum is σ = 12920622. Its totient is φ = 5766120.

The previous prime is 8649253. The next prime is 8649283. The reversal of 8649261 is 1629468.

8649261 is a `hidden beast` number, since 8 + 649 + 2 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 8555625 + 93636 = 2925^2 + 306^2 .

It is not a de Polignac number, because 8649261 - 2³ = 8649253 is a prime.

It is a super-2 number, since 2×8649261² = 149619431692242, which contains 22 as substring.

8649261 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8649211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 53310 + ... + 53471.

Almost surely, 2^8649261 is an apocalyptic number.

8649261 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

8649261 is a deficient number, since it is larger than the sum of its proper divisors (4271361).

8649261 is a wasteful number, since it uses less digits than its factorization.

8649261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106793 (or 106784 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 8649261 is about 2940.9625975180. The cubic root of 8649261 is about 205.2704026406.

The spelling of 8649261 in words is "eight million, six hundred forty-nine thousand, two hundred sixty-one".