81065529 has 32 divisors (see below), whose sum is σ = 123118080. Its totient is φ = 53362800.

The previous prime is 81065521. The next prime is 81065539. The reversal of 81065529 is 92556018.

It is a happy number.

It is not a de Polignac number, because 81065529 - 2³ = 81065521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81065493 and 81065502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81065521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 220704 + ... + 221070.

It is an arithmetic number, because the mean of its divisors is an integer number (3847440).

Almost surely, 2^81065529 is an apocalyptic number.

It is an amenable number.

81065529 is a deficient number, since it is larger than the sum of its proper divisors (42052551).

81065529 is an equidigital number, since it uses as much as digits as its factorization.

81065529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 471 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 81065529 is about 9003.6397640066. The cubic root of 81065529 is about 432.7915176324.

The spelling of 81065529 in words is "eighty-one million, sixty-five thousand, five hundred twenty-nine".