841009 has 4 divisors (see below), whose sum is σ = 905716. Its totient is φ = 776304.

The previous prime is 841003. The next prime is 841013. The reversal of 841009 is 900148.

841009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 245025 + 595984 = 495^2 + 772^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-841009 is a prime.

It is a super-2 number, since 2×841009² = 1414592276162, which contains 22 as substring.

It is a Duffinian number.

841009 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (841003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32334 + ... + 32359.

It is an arithmetic number, because the mean of its divisors is an integer number (226429).

2⁸⁴¹⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

841009 is a deficient number, since it is larger than the sum of its proper divisors (64707).

841009 is a wasteful number, since it uses less digits than its factorization.

841009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64706.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 841009 is about 917.0654284183. The cubic root of 841009 is about 94.3916434837.

It can be divided in two parts, 84100 and 9, that multiplied together give a square (756900 = 870²).

The spelling of 841009 in words is "eight hundred forty-one thousand, nine".