1909191820101 has 4 divisors (see below), whose sum is σ = 2545589093472. Its totient is φ = 1272794546732.

The previous prime is 1909191820091. The next prime is 1909191820157. The reversal of 1909191820101 is 1010281919091.

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 1909191820101 - 2⁶ = 1909191820037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1909191820181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 318198636681 + ... + 318198636686.

It is an arithmetic number, because the mean of its divisors is an integer number (636397273368).

Almost surely, 2^{1909191820101} is an apocalyptic number.

It is an amenable number.

1909191820101 is a deficient number, since it is larger than the sum of its proper divisors (636397273371).

1909191820101 is an equidigital number, since it uses as much as digits as its factorization.

1909191820101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636397273370.

The product of its (nonzero) digits is 11664, while the sum is 42.

The spelling of 1909191820101 in words is "one trillion, nine hundred nine billion, one hundred ninety-one million, eight hundred twenty thousand, one hundred one".