9609657821 has 4 divisors (see below), whose sum is σ = 9609880512. Its totient is φ = 9609435132.

The previous prime is 9609657817. The next prime is 9609657823. The reversal of 9609657821 is 1287569069.

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 9609657821 - 2² = 9609657817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9609657823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23531 + ... + 140616.

It is an arithmetic number, because the mean of its divisors is an integer number (2402470128).

Almost surely, 2^9609657821 is an apocalyptic number.

It is an amenable number.

9609657821 is a deficient number, since it is larger than the sum of its proper divisors (222691).

9609657821 is a wasteful number, since it uses less digits than its factorization.

9609657821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222690.

The product of its (nonzero) digits is 1632960, while the sum is 53.

The square root of 9609657821 is about 98028.8621835427. The cubic root of 9609657821 is about 2126.0296054884.

The spelling of 9609657821 in words is "nine billion, six hundred nine million, six hundred fifty-seven thousand, eight hundred twenty-one".