81436223 has 16 divisors (see below), whose sum is σ = 96051840. Its totient is φ = 68234400.

The previous prime is 81436211. The next prime is 81436237. The reversal of 81436223 is 32263418.

It is a cyclic number.

It is not a de Polignac number, because 81436223 - 2²⁶ = 14327359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81436723) 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, 2468 + ... + 12998.

It is an arithmetic number, because the mean of its divisors is an integer number (6003240).

Almost surely, 2^81436223 is an apocalyptic number.

81436223 is a deficient number, since it is larger than the sum of its proper divisors (14615617).

81436223 is a wasteful number, since it uses less digits than its factorization.

81436223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10598.

The product of its digits is 6912, while the sum is 29.

The square root of 81436223 is about 9024.2020699893. The cubic root of 81436223 is about 433.4501999716.

The spelling of 81436223 in words is "eighty-one million, four hundred thirty-six thousand, two hundred twenty-three".