8019809549 has 4 divisors (see below), whose sum is σ = 8020252800. Its totient is φ = 8019366300.

The previous prime is 8019809467. The next prime is 8019809563. The reversal of 8019809549 is 9459089108.

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 8019809549 - 2⁸ = 8019809293 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8019809549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8019809569) 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, 193277 + ... + 231074.

It is an arithmetic number, because the mean of its divisors is an integer number (2005063200).

Almost surely, 2^8019809549 is an apocalyptic number.

It is an amenable number.

8019809549 is a deficient number, since it is larger than the sum of its proper divisors (443251).

8019809549 is a wasteful number, since it uses less digits than its factorization.

8019809549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443250.

The product of its (nonzero) digits is 933120, while the sum is 53.

The square root of 8019809549 is about 89553.3893775104. The cubic root of 8019809549 is about 2001.6494350580.

The spelling of 8019809549 in words is "eight billion, nineteen million, eight hundred nine thousand, five hundred forty-nine".