19191000201091 has 4 divisors (see below), whose sum is σ = 19516271391000. Its totient is φ = 18865729011184.

The previous prime is 19191000201077. The next prime is 19191000201103. The reversal of 19191000201091 is 19010200019191.

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 19191000201091 - 2⁹ = 19191000200579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19191000201041) 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, 162635594866 + ... + 162635594983.

It is an arithmetic number, because the mean of its divisors is an integer number (4879067847750).

Almost surely, 2^{19191000201091} is an apocalyptic number.

19191000201091 is a deficient number, since it is larger than the sum of its proper divisors (325271189909).

19191000201091 is an equidigital number, since it uses as much as digits as its factorization.

19191000201091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325271189908.

The product of its (nonzero) digits is 1458, while the sum is 34.

The spelling of 19191000201091 in words is "nineteen trillion, one hundred ninety-one billion, two hundred one thousand, ninety-one".