1091000191099 has 16 divisors (see below), whose sum is σ = 1343115175360. Its totient is φ = 862986700800.

The previous prime is 1091000191033. The next prime is 1091000191109. The reversal of 1091000191099 is 9901910001901.

It is not a de Polignac number, because 1091000191099 - 2⁷ = 1091000190971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1091000192099) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1187502 + ... + 1895299.

It is an arithmetic number, because the mean of its divisors is an integer number (83944698460).

Almost surely, 2^{1091000191099} is an apocalyptic number.

1091000191099 is a deficient number, since it is larger than the sum of its proper divisors (252114984261).

1091000191099 is a wasteful number, since it uses less digits than its factorization.

1091000191099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3086710.

The product of its (nonzero) digits is 6561, while the sum is 40.

The spelling of 1091000191099 in words is "one trillion, ninety-one billion, one hundred ninety-one thousand, ninety-nine".