81141133 has 4 divisors (see below), whose sum is σ = 81162460. Its totient is φ = 81119808.

The previous prime is 81141113. The next prime is 81141149. The reversal of 81141133 is 33114118.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33114118 = 2 ⋅16557059.

It can be written as a sum of positive squares in 2 ways, for example, as 48399849 + 32741284 = 6957^2 + 5722^2 .

It is a cyclic number.

It is not a de Polignac number, because 81141133 - 2¹³ = 81132941 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 (81141103) 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, 3228 + ... + 13141.

It is an arithmetic number, because the mean of its divisors is an integer number (20290615).

Almost surely, 2^81141133 is an apocalyptic number.

It is an amenable number.

81141133 is a deficient number, since it is larger than the sum of its proper divisors (21327).

81141133 is a wasteful number, since it uses less digits than its factorization.

81141133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21326.

The product of its digits is 288, while the sum is 22.

The square root of 81141133 is about 9007.8373098097. The cubic root of 81141133 is about 432.9260203550.

The spelling of 81141133 in words is "eighty-one million, one hundred forty-one thousand, one hundred thirty-three".