81441343 has 4 divisors (see below), whose sum is σ = 82422648. Its totient is φ = 80460040.

The previous prime is 81441313. The next prime is 81441361. The reversal of 81441343 is 34314418.

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 81441343 - 2¹³ = 81433151 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 (81441313) 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, 490528 + ... + 490693.

It is an arithmetic number, because the mean of its divisors is an integer number (20605662).

Almost surely, 2^81441343 is an apocalyptic number.

81441343 is a gapful number since it is divisible by the number (83) formed by its first and last digit.

81441343 is a deficient number, since it is larger than the sum of its proper divisors (981305).

81441343 is an equidigital number, since it uses as much as digits as its factorization.

81441343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981304.

The product of its digits is 4608, while the sum is 28.

The square root of 81441343 is about 9024.4857471215. The cubic root of 81441343 is about 433.4592836383.

The spelling of 81441343 in words is "eighty-one million, four hundred forty-one thousand, three hundred forty-three".