805641 has 4 divisors (see below), whose sum is σ = 1074192. Its totient is φ = 537092.

The previous prime is 805639. The next prime is 805687. The reversal of 805641 is 146508.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 805641 - 2¹ = 805639 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (805241) 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, 134271 + ... + 134276.

It is an arithmetic number, because the mean of its divisors is an integer number (268548).

2⁸⁰⁵⁶⁴¹ is an apocalyptic number.

It is an amenable number.

805641 is a deficient number, since it is larger than the sum of its proper divisors (268551).

805641 is a wasteful number, since it uses less digits than its factorization.

805641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268550.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 805641 is about 897.5750664986. The cubic root of 805641 is about 93.0494591816.

The spelling of 805641 in words is "eight hundred five thousand, six hundred forty-one".