1801992081191 has 4 divisors (see below), whose sum is σ = 1802001999000. Its totient is φ = 1801982163384.

The previous prime is 1801992081163. The next prime is 1801992081221. The reversal of 1801992081191 is 1911802991081.

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

It is a cyclic number.

It is not a de Polignac number, because 1801992081191 - 2²² = 1801987886887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1801992081121) 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, 4681181 + ... + 5051478.

It is an arithmetic number, because the mean of its divisors is an integer number (450500499750).

Almost surely, 2^{1801992081191} is an apocalyptic number.

1801992081191 is a deficient number, since it is larger than the sum of its proper divisors (9917809).

1801992081191 is an equidigital number, since it uses as much as digits as its factorization.

1801992081191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9917808.

The product of its (nonzero) digits is 93312, while the sum is 50.

The spelling of 1801992081191 in words is "one trillion, eight hundred one billion, nine hundred ninety-two million, eighty-one thousand, one hundred ninety-one".