1091019091091 has 8 divisors (see below), whose sum is σ = 1097897832720. Its totient is φ = 1084142610432.

The previous prime is 1091019091079. The next prime is 1091019091109. The reversal of 1091019091091 is 1901909101901.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1091019091091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1091019091691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 408155 + ... + 1532523.

It is an arithmetic number, because the mean of its divisors is an integer number (137237229090).

Almost surely, 2^{1091019091091} is an apocalyptic number.

1091019091091 is a deficient number, since it is larger than the sum of its proper divisors (6878741629).

1091019091091 is a wasteful number, since it uses less digits than its factorization.

1091019091091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130485.

The product of its (nonzero) digits is 6561, while the sum is 41.

The spelling of 1091019091091 in words is "one trillion, ninety-one billion, nineteen million, ninety-one thousand, ninety-one".