9699240821 has 4 divisors (see below), whose sum is σ = 10209727200. Its totient is φ = 9188754444.

The previous prime is 9699240799. The next prime is 9699240841. The reversal of 9699240821 is 1280429969.

It is a happy number.

9699240821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 9699240821 - 2¹⁸ = 9698978677 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9699240821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9699240841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255243161 + ... + 255243198.

It is an arithmetic number, because the mean of its divisors is an integer number (2552431800).

Almost surely, 2^9699240821 is an apocalyptic number.

It is an amenable number.

9699240821 is a deficient number, since it is larger than the sum of its proper divisors (510486379).

9699240821 is a wasteful number, since it uses less digits than its factorization.

9699240821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510486378.

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 9699240821 is about 98484.7237951145. The cubic root of 9699240821 is about 2132.6155955933.

The spelling of 9699240821 in words is "nine billion, six hundred ninety-nine million, two hundred forty thousand, eight hundred twenty-one".