1091091100920 has 32 divisors (see below), whose sum is σ = 3273273303120. Its totient is φ = 290957626880.

The previous prime is 1091091100919. The next prime is 1091091100927. The reversal of 1091091100920 is 290011901901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091091100927) 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, 4546212801 + ... + 4546213040.

Almost surely, 2^{1091091100920} is an apocalyptic number.

1091091100920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1091091100920 is an abundant number, since it is smaller than the sum of its proper divisors (2182182202200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1091091100920 is a wasteful number, since it uses less digits than its factorization.

1091091100920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9092425855 (or 9092425851 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 33.

The spelling of 1091091100920 in words is "one trillion, ninety-one billion, ninety-one million, one hundred thousand, nine hundred twenty".