1820009190091 has 16 divisors (see below), whose sum is σ = 2006432080128. Its totient is φ = 1643774284800.

The previous prime is 1820009190089. The next prime is 1820009190107. The reversal of 1820009190091 is 1900919000281.

It is a cyclic number.

It is not a de Polignac number, because 1820009190091 - 2¹ = 1820009190089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1820009199091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21360795 + ... + 21445828.

It is an arithmetic number, because the mean of its divisors is an integer number (125402005008).

Almost surely, 2^{1820009190091} is an apocalyptic number.

1820009190091 is a deficient number, since it is larger than the sum of its proper divisors (186422890037).

1820009190091 is a wasteful number, since it uses less digits than its factorization.

1820009190091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42806742.

The product of its (nonzero) digits is 11664, while the sum is 40.

The spelling of 1820009190091 in words is "one trillion, eight hundred twenty billion, nine million, one hundred ninety thousand, ninety-one".