81456527 has 2 divisors, whose sum is σ = 81456528. Its totient is φ = 81456526.

The previous prime is 81456517. The next prime is 81456541. The reversal of 81456527 is 72565418.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81456527 - 2⁴ = 81456511 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81456517) 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 as a sum of consecutive naturals, namely, 40728263 + 40728264.

It is an arithmetic number, because the mean of its divisors is an integer number (40728264).

Almost surely, 2^81456527 is an apocalyptic number.

81456527 is a deficient number, since it is larger than the sum of its proper divisors (1).

81456527 is an equidigital number, since it uses as much as digits as its factorization.

81456527 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 67200, while the sum is 38.

The square root of 81456527 is about 9025.3269746863. The cubic root of 81456527 is about 433.4862201488.

The spelling of 81456527 in words is "eighty-one million, four hundred fifty-six thousand, five hundred twenty-seven".