9897749 has 2 divisors, whose sum is σ = 9897750. Its totient is φ = 9897748.

The previous prime is 9897743. The next prime is 9897761. The reversal of 9897749 is 9477989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9891025 + 6724 = 3145^2 + 82^2 .

It is an emirp because it is prime and its reverse (9477989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9897749 - 2²⁰ = 8849173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9897749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9897743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4948874 + 4948875.

It is an arithmetic number, because the mean of its divisors is an integer number (4948875).

Almost surely, 2^9897749 is an apocalyptic number.

It is an amenable number.

9897749 is a deficient number, since it is larger than the sum of its proper divisors (1).

9897749 is an equidigital number, since it uses as much as digits as its factorization.

9897749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 53.

The square root of 9897749 is about 3146.0688167934. The cubic root of 9897749 is about 214.7066415509.

The spelling of 9897749 in words is "nine million, eight hundred ninety-seven thousand, seven hundred forty-nine".