90243545 has 24 divisors (see below), whose sum is σ = 126462024. Its totient is φ = 61641216.

The previous prime is 90243539. The next prime is 90243557. The reversal of 90243545 is 54534209.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 23396569 + 66846976 = 4837^2 + 8176^2 .

It is not a de Polignac number, because 90243545 - 2¹⁰ = 90242521 is a prime.

It is a Duffinian number.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 82019 + ... + 83111.

It is an arithmetic number, because the mean of its divisors is an integer number (5269251).

Almost surely, 2^90243545 is an apocalyptic number.

It is an amenable number.

90243545 is a deficient number, since it is larger than the sum of its proper divisors (36218479).

90243545 is a wasteful number, since it uses less digits than its factorization.

90243545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449 (or 1442 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 90243545 is about 9499.6602570829. The cubic root of 90243545 is about 448.5443415861.

The spelling of 90243545 in words is "ninety million, two hundred forty-three thousand, five hundred forty-five".