90018109 has 4 divisors (see below), whose sum is σ = 90489600. Its totient is φ = 89546620.

The previous prime is 90018107. The next prime is 90018119. The reversal of 90018109 is 90181009.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 90018109 - 2¹ = 90018107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90018107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235459 + ... + 235840.

It is an arithmetic number, because the mean of its divisors is an integer number (22622400).

Almost surely, 2^90018109 is an apocalyptic number.

It is an amenable number.

90018109 is a deficient number, since it is larger than the sum of its proper divisors (471491).

90018109 is a wasteful number, since it uses less digits than its factorization.

90018109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471490.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 90018109 is about 9487.7873606020. The cubic root of 90018109 is about 448.1705295876.

The spelling of 90018109 in words is "ninety million, eighteen thousand, one hundred nine".