90218109 has 8 divisors (see below), whose sum is σ = 120790912. Its totient is φ = 59895360.

The previous prime is 90218087. The next prime is 90218111. The reversal of 90218109 is 90181209.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90218109 - 2¹² = 90214013 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 (90218119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61669 + ... + 63114.

It is an arithmetic number, because the mean of its divisors is an integer number (15098864).

Almost surely, 2^90218109 is an apocalyptic number.

It is an amenable number.

90218109 is a deficient number, since it is larger than the sum of its proper divisors (30572803).

90218109 is a wasteful number, since it uses less digits than its factorization.

90218109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125027.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 90218109 is about 9498.3213780120. The cubic root of 90218109 is about 448.5021954656.

The spelling of 90218109 in words is "ninety million, two hundred eighteen thousand, one hundred nine".