819206002091 has 4 divisors (see below), whose sum is σ = 829575698400. Its totient is φ = 808836305784.

The previous prime is 819206002073. The next prime is 819206002177. The reversal of 819206002091 is 190200602918.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 819206002091 - 2¹⁴ = 819205985707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (819206002061) 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, 5184848036 + ... + 5184848193.

It is an arithmetic number, because the mean of its divisors is an integer number (207393924600).

Almost surely, 2^819206002091 is an apocalyptic number.

819206002091 is a deficient number, since it is larger than the sum of its proper divisors (10369696309).

819206002091 is a wasteful number, since it uses less digits than its factorization.

819206002091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10369696308.

The product of its (nonzero) digits is 15552, while the sum is 38.

The spelling of 819206002091 in words is "eight hundred nineteen billion, two hundred six million, two thousand, ninety-one".