81227319 has 16 divisors (see below), whose sum is σ = 110172384. Its totient is φ = 53222400.

The previous prime is 81227303. The next prime is 81227351. The reversal of 81227319 is 91372218.

It is not a de Polignac number, because 81227319 - 2⁴ = 81227303 is a prime.

It is a super-2 number, since 2×81227319² = 13195754703855522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81227319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81227359) 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, 91759 + ... + 92639.

It is an arithmetic number, because the mean of its divisors is an integer number (6885774).

Almost surely, 2^81227319 is an apocalyptic number.

81227319 is a deficient number, since it is larger than the sum of its proper divisors (28945065).

81227319 is a wasteful number, since it uses less digits than its factorization.

81227319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378.

The product of its digits is 6048, while the sum is 33.

The square root of 81227319 is about 9012.6199853317. The cubic root of 81227319 is about 433.0792470343.

The spelling of 81227319 in words is "eighty-one million, two hundred twenty-seven thousand, three hundred nineteen".