9897121 has 8 divisors (see below), whose sum is σ = 10805480. Its totient is φ = 9009792.

The previous prime is 9897109. The next prime is 9897127. The reversal of 9897121 is 1217989.

9897121 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2927521 + 6969600 = 1711^2 + 2640^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 9897121 - 2¹³ = 9888929 is a prime.

It is a deceptive number, since it divides R_9897120.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9897127) 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, 4266 + ... + 6163.

It is an arithmetic number, because the mean of its divisors is an integer number (1350685).

Almost surely, 2^9897121 is an apocalyptic number.

It is an amenable number.

9897121 is a deficient number, since it is larger than the sum of its proper divisors (908359).

9897121 is a wasteful number, since it uses less digits than its factorization.

9897121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10515.

The product of its digits is 9072, while the sum is 37.

The square root of 9897121 is about 3145.9690081118. The cubic root of 9897121 is about 214.7021004974.

It can be divided in two parts, 9 and 897121, that added together give a triangular number (897130 = T₁₃₃₉).

The spelling of 9897121 in words is "nine million, eight hundred ninety-seven thousand, one hundred twenty-one".