1801112111081 has 4 divisors (see below), whose sum is σ = 1808977229700. Its totient is φ = 1793246992464.

The previous prime is 1801112111077. The next prime is 1801112111089.

1801112111081 is nontrivially palindromic in base 10.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1003513080025 + 797599031056 = 1001755^2 + 893084^2 .

It is a cyclic number.

It is not a de Polignac number, because 1801112111081 - 2² = 1801112111077 is a prime.

It is a super-3 number, since 3×1801112111081³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1801112111081.

It is not an unprimeable number, because it can be changed into a prime (1801112111089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3932558966 + ... + 3932559423.

It is an arithmetic number, because the mean of its divisors is an integer number (452244307425).

Almost surely, 2^{1801112111081} is an apocalyptic number.

It is an amenable number.

1801112111081 is a deficient number, since it is larger than the sum of its proper divisors (7865118619).

1801112111081 is an equidigital number, since it uses as much as digits as its factorization.

1801112111081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7865118618.

The product of its (nonzero) digits is 128, while the sum is 26.

The spelling of 1801112111081 in words is "one trillion, eight hundred one billion, one hundred twelve million, one hundred eleven thousand, eighty-one".