81830219 has 8 divisors (see below), whose sum is σ = 85202880. Its totient is φ = 78523200.

The previous prime is 81830201. The next prime is 81830233. The reversal of 81830219 is 91203818.

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

It is not a de Polignac number, because 81830219 - 2¹² = 81826123 is a prime.

It is a super-2 number, since 2×81830219² = 13392369483175922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81838219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13859 + ... + 18860.

It is an arithmetic number, because the mean of its divisors is an integer number (10650360).

Almost surely, 2^81830219 is an apocalyptic number.

81830219 is a deficient number, since it is larger than the sum of its proper divisors (3372661).

81830219 is a wasteful number, since it uses less digits than its factorization.

81830219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32821.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 81830219 is about 9046.0056931222. The cubic root of 81830219 is about 434.1480997673.

The spelling of 81830219 in words is "eighty-one million, eight hundred thirty thousand, two hundred nineteen".