81144335 has 8 divisors (see below), whose sum is σ = 98969856. Its totient is φ = 63851040.

The previous prime is 81144313. The next prime is 81144353. The reversal of 81144335 is 53344118.

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

It is not a de Polignac number, because 81144335 - 2¹⁰ = 81143311 is a prime.

It is a super-3 number, since 3×81144335³ (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 = 81144298 and 81144307.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132719 + ... + 133328.

It is an arithmetic number, because the mean of its divisors is an integer number (12371232).

Almost surely, 2^81144335 is an apocalyptic number.

81144335 is a deficient number, since it is larger than the sum of its proper divisors (17825521).

81144335 is a wasteful number, since it uses less digits than its factorization.

81144335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266113.

The product of its digits is 5760, while the sum is 29.

The square root of 81144335 is about 9008.0150421722. The cubic root of 81144335 is about 432.9317150042.

The spelling of 81144335 in words is "eighty-one million, one hundred forty-four thousand, three hundred thirty-five".