9667921 has 2 divisors, whose sum is σ = 9667922. Its totient is φ = 9667920.

The previous prime is 9667919. The next prime is 9667927. The reversal of 9667921 is 1297669.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9641025 + 26896 = 3105^2 + 164^2 .

It is an emirp because it is prime and its reverse (1297669) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9667921 - 2¹ = 9667919 is a prime.

Together with 9667919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (9667927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4833960 + 4833961.

It is an arithmetic number, because the mean of its divisors is an integer number (4833961).

Almost surely, 2^9667921 is an apocalyptic number.

It is an amenable number.

9667921 is a deficient number, since it is larger than the sum of its proper divisors (1).

9667921 is an equidigital number, since it uses as much as digits as its factorization.

9667921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 40.

The square root of 9667921 is about 3109.3280624598. The cubic root of 9667921 is about 213.0317643856.

The spelling of 9667921 in words is "nine million, six hundred sixty-seven thousand, nine hundred twenty-one".