90805243 has 4 divisors (see below), whose sum is σ = 90855648. Its totient is φ = 90754840.

The previous prime is 90805241. The next prime is 90805249. The reversal of 90805243 is 34250809.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34250809 = 281 ⋅121889.

It is a cyclic number.

It is not a de Polignac number, because 90805243 - 2¹ = 90805241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90805241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22396 + ... + 26137.

It is an arithmetic number, because the mean of its divisors is an integer number (22713912).

Almost surely, 2^90805243 is an apocalyptic number.

90805243 is a deficient number, since it is larger than the sum of its proper divisors (50405).

90805243 is a wasteful number, since it uses less digits than its factorization.

90805243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50404.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 90805243 is about 9529.1785060413. The cubic root of 90805243 is about 449.4730341742.

The spelling of 90805243 in words is "ninety million, eight hundred five thousand, two hundred forty-three".