81675045 has 12 divisors (see below), whose sum is σ = 141570156. Its totient is φ = 43560000.

The previous prime is 81675043. The next prime is 81675059. The reversal of 81675045 is 54057618.

It can be written as a sum of positive squares in 2 ways, for example, as 36072036 + 45603009 = 6006^2 + 6753^2 .

It is not a de Polignac number, because 81675045 - 2¹ = 81675043 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81675043) 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 in 11 ways as a sum of consecutive naturals, for example, 907456 + ... + 907545.

It is an arithmetic number, because the mean of its divisors is an integer number (11797513).

Almost surely, 2^81675045 is an apocalyptic number.

It is an amenable number.

81675045 is a deficient number, since it is larger than the sum of its proper divisors (59895111).

81675045 is a wasteful number, since it uses less digits than its factorization.

81675045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1815012 (or 1815009 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 81675045 is about 9037.4246884829. The cubic root of 81675045 is about 433.8735022472.

The spelling of 81675045 in words is "eighty-one million, six hundred seventy-five thousand, forty-five".