9909749 has 2 divisors, whose sum is σ = 9909750. Its totient is φ = 9909748.

The previous prime is 9909719. The next prime is 9909751. The reversal of 9909749 is 9479099.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9394225 + 515524 = 3065^2 + 718^2 .

It is a cyclic number.

It is not a de Polignac number, because 9909749 - 2¹² = 9905653 is a prime.

Together with 9909751, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9909719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4954874 + 4954875.

It is an arithmetic number, because the mean of its divisors is an integer number (4954875).

Almost surely, 2^9909749 is an apocalyptic number.

It is an amenable number.

9909749 is a deficient number, since it is larger than the sum of its proper divisors (1).

9909749 is an equidigital number, since it uses as much as digits as its factorization.

9909749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 183708, while the sum is 47.

The square root of 9909749 is about 3147.9753810981. The cubic root of 9909749 is about 214.7933763954.

The spelling of 9909749 in words is "nine million, nine hundred nine thousand, seven hundred forty-nine".