9766240921 has 4 divisors (see below), whose sum is σ = 9778022500. Its totient is φ = 9754459344.

The previous prime is 9766240907. The next prime is 9766240963. The reversal of 9766240921 is 1290426679.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1290426679 = 229 ⋅5635051.

It can be written as a sum of positive squares in 2 ways, for example, as 6062179600 + 3704061321 = 77860^2 + 60861^2 .

It is a cyclic number.

It is not a de Polignac number, because 9766240921 - 2⁵ = 9766240889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9766240721) 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, 5889546 + ... + 5891203.

It is an arithmetic number, because the mean of its divisors is an integer number (2444505625).

Almost surely, 2^9766240921 is an apocalyptic number.

It is an amenable number.

9766240921 is a deficient number, since it is larger than the sum of its proper divisors (11781579).

9766240921 is a wasteful number, since it uses less digits than its factorization.

9766240921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11781578.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 9766240921 is about 98824.2931722762. The cubic root of 9766240921 is about 2137.5148693652.

The spelling of 9766240921 in words is "nine billion, seven hundred sixty-six million, two hundred forty thousand, nine hundred twenty-one".