81223027 has 4 divisors (see below), whose sum is σ = 81249280. Its totient is φ = 81196776.

The previous prime is 81222983. The next prime is 81223031. The reversal of 81223027 is 72032218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72032218 = 2 ⋅36016109.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81223027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81222992 and 81223010.

It is not an unprimeable number, because it can be changed into a prime (81223057) 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 3 ways as a sum of consecutive naturals, for example, 7752 + ... + 14917.

It is an arithmetic number, because the mean of its divisors is an integer number (20312320).

Almost surely, 2^81223027 is an apocalyptic number.

81223027 is a deficient number, since it is larger than the sum of its proper divisors (26253).

81223027 is a wasteful number, since it uses less digits than its factorization.

81223027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26252.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 81223027 is about 9012.3818716253. The cubic root of 81223027 is about 433.0716190224.

The spelling of 81223027 in words is "eighty-one million, two hundred twenty-three thousand, twenty-seven".