81045530 has 8 divisors (see below), whose sum is σ = 145881972. Its totient is φ = 32418208.

The previous prime is 81045529. The next prime is 81045557. The reversal of 81045530 is 3554018.

It can be written as a sum of positive squares in 2 ways, for example, as 75290329 + 5755201 = 8677^2 + 2399^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 81045530.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 4052267 + ... + 4052286.

Almost surely, 2^81045530 is an apocalyptic number.

81045530 is a deficient number, since it is larger than the sum of its proper divisors (64836442).

81045530 is a wasteful number, since it uses less digits than its factorization.

81045530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8104560.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 81045530 is about 9002.5290890949. The cubic root of 81045530 is about 432.7559245777.

Adding to 81045530 its reverse (3554018), we get a palindrome (84599548).

The spelling of 81045530 in words is "eighty-one million, forty-five thousand, five hundred thirty".