81085331 has 8 divisors (see below), whose sum is σ = 87435600. Its totient is φ = 74943360.

The previous prime is 81085321. The next prime is 81085423. The reversal of 81085331 is 13358018.

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 81085331 - 2¹⁰ = 81084307 is a prime.

It is a super-2 number, since 2×81085331² = 13149661806759122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81085294 and 81085303.

It is not an unprimeable number, because it can be changed into a prime (81085321) by changing a digit.

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, 51266 + ... + 52823.

It is an arithmetic number, because the mean of its divisors is an integer number (10929450).

Almost surely, 2^81085331 is an apocalyptic number.

81085331 is a deficient number, since it is larger than the sum of its proper divisors (6350269).

81085331 is a wasteful number, since it uses less digits than its factorization.

81085331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104149.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 81085331 is about 9004.7393632464. The cubic root of 81085331 is about 432.8267543108.

The spelling of 81085331 in words is "eighty-one million, eighty-five thousand, three hundred thirty-one".