90109217 has 16 divisors (see below), whose sum is σ = 100665600. Its totient is φ = 79971840.

The previous prime is 90109213. The next prime is 90109237. The reversal of 90109217 is 71290109.

It is a cyclic number.

It is not a de Polignac number, because 90109217 - 2² = 90109213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90109217.

It is not an unprimeable number, because it can be changed into a prime (90109211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83759 + ... + 84827.

It is an arithmetic number, because the mean of its divisors is an integer number (6291600).

Almost surely, 2^90109217 is an apocalyptic number.

90109217 is a gapful number since it is divisible by the number (97) formed by its first and last digit.

It is an amenable number.

90109217 is a deficient number, since it is larger than the sum of its proper divisors (10556383).

90109217 is a wasteful number, since it uses less digits than its factorization.

90109217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256.

The product of its (nonzero) digits is 1134, while the sum is 29.

The square root of 90109217 is about 9492.5874765524. The cubic root of 90109217 is about 448.3216775191.

It can be divided in two parts, 901092 and 17, that added together give a palindrome (901109).

The spelling of 90109217 in words is "ninety million, one hundred nine thousand, two hundred seventeen".