81583227 has 32 divisors (see below), whose sum is σ = 136120320. Its totient is φ = 47844000.

The previous prime is 81583219. The next prime is 81583237. The reversal of 81583227 is 72238518.

It is not a de Polignac number, because 81583227 - 2³ = 81583219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81583191 and 81583200.

It is not an unprimeable number, because it can be changed into a prime (81583217) 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 31 ways as a sum of consecutive naturals, for example, 4777 + ... + 13637.

It is an arithmetic number, because the mean of its divisors is an integer number (4253760).

Almost surely, 2^81583227 is an apocalyptic number.

81583227 is a deficient number, since it is larger than the sum of its proper divisors (54537093).

81583227 is a wasteful number, since it uses less digits than its factorization.

81583227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8912 (or 8906 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 81583227 is about 9032.3433836408. The cubic root of 81583227 is about 433.7108563424.

It can be divided in two parts, 81583 and 227, that added together give a triangular number (81810 = T₄₀₄).

The spelling of 81583227 in words is "eighty-one million, five hundred eighty-three thousand, two hundred twenty-seven".