81371527 has 2 divisors, whose sum is σ = 81371528. Its totient is φ = 81371526.

The previous prime is 81371519. The next prime is 81371531. The reversal of 81371527 is 72517318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81371527 - 2³ = 81371519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81371492 and 81371501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81371327) by changing a digit.

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 as a sum of consecutive naturals, namely, 40685763 + 40685764.

It is an arithmetic number, because the mean of its divisors is an integer number (40685764).

Almost surely, 2^81371527 is an apocalyptic number.

81371527 is a deficient number, since it is larger than the sum of its proper divisors (1).

81371527 is an equidigital number, since it uses as much as digits as its factorization.

81371527 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11760, while the sum is 34.

The square root of 81371527 is about 9020.6167749218. The cubic root of 81371527 is about 433.3353865123.

The spelling of 81371527 in words is "eighty-one million, three hundred seventy-one thousand, five hundred twenty-seven".