81043335 has 80 divisors (see below), whose sum is σ = 156816000. Its totient is φ = 39896064.

The previous prime is 81043327. The next prime is 81043337. The reversal of 81043335 is 53334018.

It is a happy number.

It is not a de Polignac number, because 81043335 - 2³ = 81043327 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 81043299 and 81043308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81043337) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 543841 + ... + 543989.

It is an arithmetic number, because the mean of its divisors is an integer number (1960200).

Almost surely, 2^81043335 is an apocalyptic number.

81043335 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

81043335 is a deficient number, since it is larger than the sum of its proper divisors (75772665).

81043335 is a wasteful number, since it uses less digits than its factorization.

81043335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262 (or 253 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 81043335 is about 9002.4071780830. The cubic root of 81043335 is about 432.7520176881.

The spelling of 81043335 in words is "eighty-one million, forty-three thousand, three hundred thirty-five".