81270023 has 2 divisors, whose sum is σ = 81270024. Its totient is φ = 81270022.

The previous prime is 81270001. The next prime is 81270071. The reversal of 81270023 is 32007218.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81270023 - 2¹² = 81265927 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81270823) 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, 40635011 + 40635012.

It is an arithmetic number, because the mean of its divisors is an integer number (40635012).

Almost surely, 2^81270023 is an apocalyptic number.

81270023 is a deficient number, since it is larger than the sum of its proper divisors (1).

81270023 is an equidigital number, since it uses as much as digits as its factorization.

81270023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 81270023 is about 9014.9887964434. The cubic root of 81270023 is about 433.1551286315.

The spelling of 81270023 in words is "eighty-one million, two hundred seventy thousand, twenty-three".