9808749649 has 4 divisors (see below), whose sum is σ = 10125160960. Its totient is φ = 9492338340.

The previous prime is 9808749619. The next prime is 9808749653. The reversal of 9808749649 is 9469478089.

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 an emirpimes, since its reverse is a distinct semiprime: 9469478089 = 25229 ⋅375341.

It is a cyclic number.

It is not a de Polignac number, because 9808749649 - 2⁷ = 9808749521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9808749619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158205609 + ... + 158205670.

It is an arithmetic number, because the mean of its divisors is an integer number (2531290240).

Almost surely, 2^9808749649 is an apocalyptic number.

It is an amenable number.

9808749649 is a deficient number, since it is larger than the sum of its proper divisors (316411311).

9808749649 is a wasteful number, since it uses less digits than its factorization.

9808749649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316411310.

The product of its (nonzero) digits is 31352832, while the sum is 64.

The square root of 9808749649 is about 99039.1319075445. The cubic root of 9808749649 is about 2140.6116434477.

The spelling of 9808749649 in words is "nine billion, eight hundred eight million, seven hundred forty-nine thousand, six hundred forty-nine".