809594545981 has 8 divisors (see below), whose sum is σ = 873356357664. Its totient is φ = 746044921200.

The previous prime is 809594545951. The next prime is 809594546009. The reversal of 809594545981 is 189545495908.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 809594545981 - 2³⁹ = 259838732093 is a prime.

It is a super-2 number, since 2×809594545981² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809594545951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53038795 + ... + 53054056.

It is an arithmetic number, because the mean of its divisors is an integer number (109169544708).

Almost surely, 2^809594545981 is an apocalyptic number.

It is an amenable number.

809594545981 is a deficient number, since it is larger than the sum of its proper divisors (63761811683).

809594545981 is a wasteful number, since it uses less digits than its factorization.

809594545981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106093451.

The product of its (nonzero) digits is 93312000, while the sum is 67.

The spelling of 809594545981 in words is "eight hundred nine billion, five hundred ninety-four million, five hundred forty-five thousand, nine hundred eighty-one".