841661 has 2 divisors, whose sum is σ = 841662. Its totient is φ = 841660.

The previous prime is 841651. The next prime is 841663. The reversal of 841661 is 166148.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 504100 + 337561 = 710^2 + 581^2 .

It is a cyclic number.

It is not a de Polignac number, because 841661 - 2⁶ = 841597 is a prime.

Together with 841663, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 841661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (841663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420830 + 420831.

It is an arithmetic number, because the mean of its divisors is an integer number (420831).

2⁸⁴¹⁶⁶¹ is an apocalyptic number.

It is an amenable number.

841661 is a deficient number, since it is larger than the sum of its proper divisors (1).

841661 is an equidigital number, since it uses as much as digits as its factorization.

841661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 26.

The square root of 841661 is about 917.4208412719. The cubic root of 841661 is about 94.4160298475.

The spelling of 841661 in words is "eight hundred forty-one thousand, six hundred sixty-one".