90843505 has 4 divisors (see below), whose sum is σ = 109012212. Its totient is φ = 72674800.

The previous prime is 90843499. The next prime is 90843509. The reversal of 90843505 is 50534809.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50534809 = 13 ⋅3887293.

It can be written as a sum of positive squares in 2 ways, for example, as 21687649 + 69155856 = 4657^2 + 8316^2 .

It is not a de Polignac number, because 90843505 - 2¹³ = 90835313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90843509) 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 3 ways as a sum of consecutive naturals, for example, 9084346 + ... + 9084355.

It is an arithmetic number, because the mean of its divisors is an integer number (27253053).

Almost surely, 2^90843505 is an apocalyptic number.

It is an amenable number.

90843505 is a deficient number, since it is larger than the sum of its proper divisors (18168707).

90843505 is a wasteful number, since it uses less digits than its factorization.

90843505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18168706.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 90843505 is about 9531.1859178174. The cubic root of 90843505 is about 449.5361557948.

The spelling of 90843505 in words is "ninety million, eight hundred forty-three thousand, five hundred five".