81830211 has 8 divisors (see below), whose sum is σ = 109738320. Its totient is φ = 54237792.

The previous prime is 81830201. The next prime is 81830233. The reversal of 81830211 is 11203818.

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

It is not a de Polignac number, because 81830211 - 2⁵ = 81830179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81830201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78316 + ... + 79353.

It is an arithmetic number, because the mean of its divisors is an integer number (13717290).

Almost surely, 2^81830211 is an apocalyptic number.

81830211 is a deficient number, since it is larger than the sum of its proper divisors (27908109).

81830211 is a wasteful number, since it uses less digits than its factorization.

81830211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157845.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 81830211 is about 9046.0052509381. The cubic root of 81830211 is about 434.1480856193.

The spelling of 81830211 in words is "eighty-one million, eight hundred thirty thousand, two hundred eleven".