19091910919091 has 2 divisors, whose sum is σ = 19091910919092. Its totient is φ = 19091910919090.

The previous prime is 19091910919063. The next prime is 19091910919111. The reversal of 19091910919091 is 19091901919091.

It is a strong prime.

It is an emirp because it is prime and its reverse (19091901919091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19091910919091 - 2⁶ = 19091910919027 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19091910919091.

It is not a weakly prime, because it can be changed into another prime (19091910919031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9545955459545 + 9545955459546.

It is an arithmetic number, because the mean of its divisors is an integer number (9545955459546).

Almost surely, 2^{19091910919091} is an apocalyptic number.

19091910919091 is a deficient number, since it is larger than the sum of its proper divisors (1).

19091910919091 is an equidigital number, since it uses as much as digits as its factorization.

19091910919091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 531441, while the sum is 59.

Subtracting from 19091910919091 its reverse (19091901919091), we obtain a square (9000000 = 3000²).

The spelling of 19091910919091 in words is "nineteen trillion, ninety-one billion, nine hundred ten million, nine hundred nineteen thousand, ninety-one".