90017089 has 4 divisors (see below), whose sum is σ = 90036180. Its totient is φ = 89998000.

The previous prime is 90017071. The next prime is 90017093. The reversal of 90017089 is 98071009.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98071009 = 2381 ⋅41189.

It can be written as a sum of positive squares in 2 ways, for example, as 9610000 + 80407089 = 3100^2 + 8967^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90017089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90017689) 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, 3207 + ... + 13795.

It is an arithmetic number, because the mean of its divisors is an integer number (22509045).

Almost surely, 2^90017089 is an apocalyptic number.

It is an amenable number.

90017089 is a deficient number, since it is larger than the sum of its proper divisors (19091).

90017089 is a wasteful number, since it uses less digits than its factorization.

90017089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19090.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 90017089 is about 9487.7336071372. The cubic root of 90017089 is about 448.1688368332.

The spelling of 90017089 in words is "ninety million, seventeen thousand, eighty-nine".