81927299 has 2 divisors, whose sum is σ = 81927300. Its totient is φ = 81927298.

The previous prime is 81927277. The next prime is 81927323. The reversal of 81927299 is 99272918.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81927299 - 2¹² = 81923203 is a prime.

It is not a weakly prime, because it can be changed into another prime (81927239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40963649 + 40963650.

It is an arithmetic number, because the mean of its divisors is an integer number (40963650).

Almost surely, 2^81927299 is an apocalyptic number.

81927299 is a deficient number, since it is larger than the sum of its proper divisors (1).

81927299 is an equidigital number, since it uses as much as digits as its factorization.

81927299 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 47.

The square root of 81927299 is about 9051.3700068001. The cubic root of 81927299 is about 434.3197170574.

The spelling of 81927299 in words is "eighty-one million, nine hundred twenty-seven thousand, two hundred ninety-nine".