9975649 has 4 divisors (see below), whose sum is σ = 9982000. Its totient is φ = 9969300.

The previous prime is 9975643. The next prime is 9975683. The reversal of 9975649 is 9465799.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9465799 = 7 ⋅1352257.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9975649 is a prime.

It is a d-powerful number, because it can be written as 9² + 9⁴ + 7⁸ + 5⁵ + 6³ + 4¹¹ + 9⁴ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9975643) 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 in 3 ways as a sum of consecutive naturals, for example, 1102 + ... + 4600.

It is an arithmetic number, because the mean of its divisors is an integer number (2495500).

Almost surely, 2^9975649 is an apocalyptic number.

It is an amenable number.

9975649 is a deficient number, since it is larger than the sum of its proper divisors (6351).

9975649 is a wasteful number, since it uses less digits than its factorization.

9975649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6350.

The product of its digits is 612360, while the sum is 49.

The square root of 9975649 is about 3158.4250822206. The cubic root of 9975649 is about 215.2684514006.

The spelling of 9975649 in words is "nine million, nine hundred seventy-five thousand, six hundred forty-nine".