8661241 has 2 divisors, whose sum is σ = 8661242. Its totient is φ = 8661240.

The previous prime is 8661239. The next prime is 8661251. The reversal of 8661241 is 1421668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7290000 + 1371241 = 2700^2 + 1171^2 .

It is a cyclic number.

It is not a de Polignac number, because 8661241 - 2¹ = 8661239 is a prime.

Together with 8661239, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8661251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4330620 + 4330621.

It is an arithmetic number, because the mean of its divisors is an integer number (4330621).

Almost surely, 2^8661241 is an apocalyptic number.

It is an amenable number.

8661241 is a deficient number, since it is larger than the sum of its proper divisors (1).

8661241 is an equidigital number, since it uses as much as digits as its factorization.

8661241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 28.

The square root of 8661241 is about 2942.9986408424. The cubic root of 8661241 is about 205.3651315398.

The spelling of 8661241 in words is "eight million, six hundred sixty-one thousand, two hundred forty-one".