801845809 has 4 divisors (see below), whose sum is σ = 844048240. Its totient is φ = 759643380.

The previous prime is 801845777. The next prime is 801845827. The reversal of 801845809 is 908548108.

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 801845809 - 2⁵ = 801845777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (801845839) 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, 21101187 + ... + 21101224.

It is an arithmetic number, because the mean of its divisors is an integer number (211012060).

Almost surely, 2^801845809 is an apocalyptic number.

It is an amenable number.

801845809 is a deficient number, since it is larger than the sum of its proper divisors (42202431).

801845809 is a wasteful number, since it uses less digits than its factorization.

801845809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42202430.

The product of its (nonzero) digits is 92160, while the sum is 43.

The square root of 801845809 is about 28316.8820494065. The cubic root of 801845809 is about 929.0311755337.

The spelling of 801845809 in words is "eight hundred one million, eight hundred forty-five thousand, eight hundred nine".