9651921 has 4 divisors (see below), whose sum is σ = 12869232. Its totient is φ = 6434612.

The previous prime is 9651919. The next prime is 9651923. The reversal of 9651921 is 1291569.

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 an interprime number because it is at equal distance from previous prime (9651919) and next prime (9651923).

It is a cyclic number.

It is not a de Polignac number, because 9651921 - 2¹ = 9651919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9651923) 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, 1608651 + ... + 1608656.

It is an arithmetic number, because the mean of its divisors is an integer number (3217308).

Almost surely, 2^9651921 is an apocalyptic number.

It is an amenable number.

9651921 is a deficient number, since it is larger than the sum of its proper divisors (3217311).

9651921 is a wasteful number, since it uses less digits than its factorization.

9651921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3217310.

The product of its digits is 4860, while the sum is 33.

The square root of 9651921 is about 3106.7540939057. The cubic root of 9651921 is about 212.9141799786.

The spelling of 9651921 in words is "nine million, six hundred fifty-one thousand, nine hundred twenty-one".