81082231 has 16 divisors (see below), whose sum is σ = 89445600. Its totient is φ = 73156608.

The previous prime is 81082229. The next prime is 81082273. The reversal of 81082231 is 13228018.

It is a cyclic number.

It is not a de Polignac number, because 81082231 - 2¹ = 81082229 is a prime.

It is a super-2 number, since 2×81082231² = 13148656367874722, 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 = 81082196 and 81082205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81082531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79855 + ... + 80863.

It is an arithmetic number, because the mean of its divisors is an integer number (5590350).

Almost surely, 2^81082231 is an apocalyptic number.

81082231 is a deficient number, since it is larger than the sum of its proper divisors (8363369).

81082231 is a wasteful number, since it uses less digits than its factorization.

81082231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1218.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 81082231 is about 9004.5672300228. The cubic root of 81082231 is about 432.8212383931.

The spelling of 81082231 in words is "eighty-one million, eighty-two thousand, two hundred thirty-one".