81433841 has 8 divisors (see below), whose sum is σ = 83209704. Its totient is φ = 79672320.

The previous prime is 81433817. The next prime is 81433853. The reversal of 81433841 is 14833418.

It can be written as a sum of positive squares in 4 ways, for example, as 73441 + 81360400 = 271^2 + 9020^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81433841 - 2¹⁸ = 81171697 is a prime.

It is a super-3 number, since 3×81433841³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81433798 and 81433807.

It is not an unprimeable number, because it can be changed into a prime (81433801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8315 + ... + 15231.

It is an arithmetic number, because the mean of its divisors is an integer number (10401213).

Almost surely, 2^81433841 is an apocalyptic number.

It is an amenable number.

81433841 is a deficient number, since it is larger than the sum of its proper divisors (1775863).

81433841 is a wasteful number, since it uses less digits than its factorization.

81433841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7171.

The product of its digits is 9216, while the sum is 32.

The square root of 81433841 is about 9024.0700905966. The cubic root of 81433841 is about 433.4459738078.

The spelling of 81433841 in words is "eighty-one million, four hundred thirty-three thousand, eight hundred forty-one".