9811897 has 4 divisors (see below), whose sum is σ = 9826596. Its totient is φ = 9797200.

The previous prime is 9811859. The next prime is 9811909. The reversal of 9811897 is 7981189.

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 6780816 + 3031081 = 2604^2 + 1741^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9811897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9811817) 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, 6298 + ... + 7699.

It is an arithmetic number, because the mean of its divisors is an integer number (2456649).

Almost surely, 2^9811897 is an apocalyptic number.

It is an amenable number.

9811897 is a deficient number, since it is larger than the sum of its proper divisors (14699).

9811897 is a wasteful number, since it uses less digits than its factorization.

9811897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14698.

The product of its digits is 36288, while the sum is 43.

The square root of 9811897 is about 3132.3947707784. The cubic root of 9811897 is about 214.0840572923.

The spelling of 9811897 in words is "nine million, eight hundred eleven thousand, eight hundred ninety-seven".