9121985 has 4 divisors (see below), whose sum is σ = 10946388. Its totient is φ = 7297584.

The previous prime is 9121963. The next prime is 9121993. The reversal of 9121985 is 5891219.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2408704 + 6713281 = 1552^2 + 2591^2 .

It is a cyclic number.

It is not a de Polignac number, because 9121985 - 2¹⁸ = 8859841 is a prime.

It is a super-2 number, since 2×9121985² = 166421220680450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 912194 + ... + 912203.

It is an arithmetic number, because the mean of its divisors is an integer number (2736597).

Almost surely, 2^9121985 is an apocalyptic number.

It is an amenable number.

9121985 is a deficient number, since it is larger than the sum of its proper divisors (1824403).

9121985 is a wasteful number, since it uses less digits than its factorization.

9121985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824402.

The product of its digits is 6480, while the sum is 35.

The square root of 9121985 is about 3020.2624058184. The cubic root of 9121985 is about 208.9439422926.

The spelling of 9121985 in words is "nine million, one hundred twenty-one thousand, nine hundred eighty-five".