81822269 has 8 divisors (see below), whose sum is σ = 83231352. Its totient is φ = 80421120.

The previous prime is 81822187. The next prime is 81822271. The reversal of 81822269 is 96222818.

It can be written as a sum of positive squares in 4 ways, for example, as 7086244 + 74736025 = 2662^2 + 8645^2 .

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 81822269 - 2¹² = 81818173 is a prime.

It is a super-2 number, since 2×81822269² = 13389767408616722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81821269) 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, 21059 + ... + 24639.

It is an arithmetic number, because the mean of its divisors is an integer number (10403919).

Almost surely, 2^81822269 is an apocalyptic number.

It is an amenable number.

81822269 is a deficient number, since it is larger than the sum of its proper divisors (1409083).

81822269 is a wasteful number, since it uses less digits than its factorization.

81822269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3967.

The product of its digits is 27648, while the sum is 38.

The square root of 81822269 is about 9045.5662619871. The cubic root of 81822269 is about 434.1340398058.

The spelling of 81822269 in words is "eighty-one million, eight hundred twenty-two thousand, two hundred sixty-nine".