1091043855979 has 32 divisors (see below), whose sum is σ = 1432077672960. Its totient is φ = 805293446400.

The previous prime is 1091043855929. The next prime is 1091043855989. The reversal of 1091043855979 is 9795583401901.

1091043855979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1091043855979 - 2¹¹ = 1091043853931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1091043855919) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9953877 + ... + 10062889.

It is an arithmetic number, because the mean of its divisors is an integer number (44752427280).

Almost surely, 2^{1091043855979} is an apocalyptic number.

1091043855979 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1091043855979 is a deficient number, since it is larger than the sum of its proper divisors (341033816981).

1091043855979 is a wasteful number, since it uses less digits than its factorization.

1091043855979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115891.

The product of its (nonzero) digits is 12247200, while the sum is 61.

The spelling of 1091043855979 in words is "one trillion, ninety-one billion, forty-three million, eight hundred fifty-five thousand, nine hundred seventy-nine".