810219099889 has 4 divisors (see below), whose sum is σ = 810295066224. Its totient is φ = 810143133556.

The previous prime is 810219099887. The next prime is 810219099913. The reversal of 810219099889 is 988990912018.

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 810219099889 - 2¹ = 810219099887 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 810219099889.

It is not an unprimeable number, because it can be changed into a prime (810219099881) 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, 37967167 + ... + 37988500.

It is an arithmetic number, because the mean of its divisors is an integer number (202573766556).

Almost surely, 2^810219099889 is an apocalyptic number.

It is an amenable number.

810219099889 is a deficient number, since it is larger than the sum of its proper divisors (75966335).

810219099889 is a wasteful number, since it uses less digits than its factorization.

810219099889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75966334.

The product of its (nonzero) digits is 6718464, while the sum is 64.

The spelling of 810219099889 in words is "eight hundred ten billion, two hundred nineteen million, ninety-nine thousand, eight hundred eighty-nine".