1820011111091 has 8 divisors (see below), whose sum is σ = 1946150496864. Its totient is φ = 1695991715200.

The previous prime is 1820011111027. The next prime is 1820011111097. The reversal of 1820011111091 is 1901111100281.

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

It is a cyclic number.

It is not a de Polignac number, because 1820011111091 - 2⁶ = 1820011111027 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1820011111091.

It is not an unprimeable number, because it can be changed into a prime (1820011111097) 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, 529995695 + ... + 529999128.

It is an arithmetic number, because the mean of its divisors is an integer number (243268812108).

Almost surely, 2^{1820011111091} is an apocalyptic number.

1820011111091 is a deficient number, since it is larger than the sum of its proper divisors (126139385773).

1820011111091 is a wasteful number, since it uses less digits than its factorization.

1820011111091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059994941.

The product of its (nonzero) digits is 144, while the sum is 26.

The spelling of 1820011111091 in words is "one trillion, eight hundred twenty billion, eleven million, one hundred eleven thousand, ninety-one".