809641 has 4 divisors (see below), whose sum is σ = 925312. Its totient is φ = 693972.

The previous prime is 809629. The next prime is 809701. The reversal of 809641 is 146908.

809641 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-809641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (809041) 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, 57825 + ... + 57838.

It is an arithmetic number, because the mean of its divisors is an integer number (231328).

2⁸⁰⁹⁶⁴¹ is an apocalyptic number.

809641 is the 520-th hex number.

It is an amenable number.

809641 is a deficient number, since it is larger than the sum of its proper divisors (115671).

809641 is a wasteful number, since it uses less digits than its factorization.

809641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115670.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 809641 is about 899.8005334517. The cubic root of 809641 is about 93.2032015822.

The spelling of 809641 in words is "eight hundred nine thousand, six hundred forty-one".