81114043001 has 4 divisors (see below), whose sum is σ = 81117580404. Its totient is φ = 81110505600.

The previous prime is 81114042991. The next prime is 81114043007. The reversal of 81114043001 is 10034041118.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10034041118 = 2 ⋅5017020559.

It can be written as a sum of positive squares in 2 ways, for example, as 12155283001 + 68958760000 = 110251^2 + 262600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81114043001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81114043007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1734080 + ... + 1780241.

It is an arithmetic number, because the mean of its divisors is an integer number (20279395101).

Almost surely, 2^81114043001 is an apocalyptic number.

It is an amenable number.

81114043001 is a deficient number, since it is larger than the sum of its proper divisors (3537403).

81114043001 is a wasteful number, since it uses less digits than its factorization.

81114043001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3537402.

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 81114043001 its reverse (10034041118), we get a palindrome (91148084119).

The spelling of 81114043001 in words is "eighty-one billion, one hundred fourteen million, forty-three thousand, one".