8649881 has 2 divisors, whose sum is σ = 8649882. Its totient is φ = 8649880.

The previous prime is 8649871. The next prime is 8649887. The reversal of 8649881 is 1889468.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8649481 + 400 = 2941^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 8649881 - 2¹⁸ = 8387737 is a prime.

It is a super-2 number, since 2×8649881² = 149640882628322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8649887) 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 as a sum of consecutive naturals, namely, 4324940 + 4324941.

It is an arithmetic number, because the mean of its divisors is an integer number (4324941).

Almost surely, 2^8649881 is an apocalyptic number.

It is an amenable number.

8649881 is a deficient number, since it is larger than the sum of its proper divisors (1).

8649881 is an equidigital number, since it uses as much as digits as its factorization.

8649881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 44.

The square root of 8649881 is about 2941.0680032940. The cubic root of 8649881 is about 205.2753072835.

The spelling of 8649881 in words is "eight million, six hundred forty-nine thousand, eight hundred eighty-one".