81045529 has 2 divisors, whose sum is σ = 81045530. Its totient is φ = 81045528.

The previous prime is 81045499. The next prime is 81045557. The reversal of 81045529 is 92554018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51451929 + 29593600 = 7173^2 + 5440^2 .

It is a cyclic number.

It is not a de Polignac number, because 81045529 - 2⁹ = 81045017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81045494 and 81045503.

It is not a weakly prime, because it can be changed into another prime (81045589) 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, 40522764 + 40522765.

It is an arithmetic number, because the mean of its divisors is an integer number (40522765).

Almost surely, 2^81045529 is an apocalyptic number.

It is an amenable number.

81045529 is a deficient number, since it is larger than the sum of its proper divisors (1).

81045529 is an equidigital number, since it uses as much as digits as its factorization.

81045529 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 81045529 is about 9002.5290335550. The cubic root of 81045529 is about 432.7559227978.

The spelling of 81045529 in words is "eighty-one million, forty-five thousand, five hundred twenty-nine".