1091992901011 has 4 divisors (see below), whose sum is σ = 1092310991512. Its totient is φ = 1091674810512.

The previous prime is 1091992900979. The next prime is 1091992901089. The reversal of 1091992901011 is 1101092991901.

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 1091992901011 - 2⁵ = 1091992900979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1091992901411) 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, 159040101 + ... + 159046966.

It is an arithmetic number, because the mean of its divisors is an integer number (273077747878).

Almost surely, 2^{1091992901011} is an apocalyptic number.

1091992901011 is a deficient number, since it is larger than the sum of its proper divisors (318090501).

1091992901011 is an equidigital number, since it uses as much as digits as its factorization.

1091992901011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318090500.

The product of its (nonzero) digits is 13122, while the sum is 43.

The spelling of 1091992901011 in words is "one trillion, ninety-one billion, nine hundred ninety-two million, nine hundred one thousand, eleven".