81227223 has 96 divisors (see below), whose sum is σ = 159744000. Its totient is φ = 38491200.

The previous prime is 81227213. The next prime is 81227227. The reversal of 81227223 is 32272218.

It is a happy number.

It is not a de Polignac number, because 81227223 - 2⁸ = 81226967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81227227) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 408078 + ... + 408276.

It is an arithmetic number, because the mean of its divisors is an integer number (1664000).

Almost surely, 2^81227223 is an apocalyptic number.

81227223 is a deficient number, since it is larger than the sum of its proper divisors (78516777).

81227223 is a wasteful number, since it uses less digits than its factorization.

81227223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273 (or 270 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 81227223 is about 9012.6146594648. The cubic root of 81227223 is about 433.0790764200.

The spelling of 81227223 in words is "eighty-one million, two hundred twenty-seven thousand, two hundred twenty-three".