81828223 has 2 divisors, whose sum is σ = 81828224. Its totient is φ = 81828222.

The previous prime is 81828217. The next prime is 81828277. The reversal of 81828223 is 32282818.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81828223 - 2¹⁷ = 81697151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81888223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40914111 + 40914112.

It is an arithmetic number, because the mean of its divisors is an integer number (40914112).

Almost surely, 2^81828223 is an apocalyptic number.

81828223 is a deficient number, since it is larger than the sum of its proper divisors (1).

81828223 is an equidigital number, since it uses as much as digits as its factorization.

81828223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12288, while the sum is 34.

The square root of 81828223 is about 9045.8953675134. The cubic root of 81828223 is about 434.1445698298.

The spelling of 81828223 in words is "eighty-one million, eight hundred twenty-eight thousand, two hundred twenty-three".