8687641 has 2 divisors, whose sum is σ = 8687642. Its totient is φ = 8687640.

The previous prime is 8687603. The next prime is 8687659. The reversal of 8687641 is 1467868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5784025 + 2903616 = 2405^2 + 1704^2 .

It is a cyclic number.

It is not a de Polignac number, because 8687641 - 2⁷ = 8687513 is a prime.

It is a super-2 number, since 2×8687641² = 150950212289762, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 8687594 and 8687603.

It is not a weakly prime, because it can be changed into another prime (8687671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4343820 + 4343821.

It is an arithmetic number, because the mean of its divisors is an integer number (4343821).

Almost surely, 2^8687641 is an apocalyptic number.

It is an amenable number.

8687641 is a deficient number, since it is larger than the sum of its proper divisors (1).

8687641 is an equidigital number, since it uses as much as digits as its factorization.

8687641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 40.

The square root of 8687641 is about 2947.4804494687. The cubic root of 8687641 is about 205.5735751213.

The spelling of 8687641 in words is "eight million, six hundred eighty-seven thousand, six hundred forty-one".