81022265 has 4 divisors (see below), whose sum is σ = 97226724. Its totient is φ = 64817808.

The previous prime is 81022231. The next prime is 81022283. The reversal of 81022265 is 56222018.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26543104 + 54479161 = 5152^2 + 7381^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81022265 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8102222 + ... + 8102231.

It is an arithmetic number, because the mean of its divisors is an integer number (24306681).

Almost surely, 2^81022265 is an apocalyptic number.

It is an amenable number.

81022265 is a deficient number, since it is larger than the sum of its proper divisors (16204459).

81022265 is a wasteful number, since it uses less digits than its factorization.

81022265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16204458.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 81022265 is about 9001.2368594544. The cubic root of 81022265 is about 432.7145115180.

The spelling of 81022265 in words is "eighty-one million, twenty-two thousand, two hundred sixty-five".