1818201100091 has 4 divisors (see below), whose sum is σ = 1818558526272. Its totient is φ = 1817843673912.

The previous prime is 1818201100069. The next prime is 1818201100099. The reversal of 1818201100091 is 1900011028181.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1818201100091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1818201100099) 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, 178705460 + ... + 178715633.

It is an arithmetic number, because the mean of its divisors is an integer number (454639631568).

Almost surely, 2^{1818201100091} is an apocalyptic number.

1818201100091 is a deficient number, since it is larger than the sum of its proper divisors (357426181).

1818201100091 is an equidigital number, since it uses as much as digits as its factorization.

1818201100091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357426180.

The product of its (nonzero) digits is 1152, while the sum is 32.

The spelling of 1818201100091 in words is "one trillion, eight hundred eighteen billion, two hundred one million, one hundred thousand, ninety-one".