9667390921 has 2 divisors, whose sum is σ = 9667390922. Its totient is φ = 9667390920.

The previous prime is 9667390919. The next prime is 9667390927. The reversal of 9667390921 is 1290937669.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5232496896 + 4434894025 = 72336^2 + 66595^2 .

It is a cyclic number.

It is not a de Polignac number, because 9667390921 - 2¹ = 9667390919 is a prime.

Together with 9667390919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (9667390927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4833695460 + 4833695461.

It is an arithmetic number, because the mean of its divisors is an integer number (4833695461).

Almost surely, 2^9667390921 is an apocalyptic number.

It is an amenable number.

9667390921 is a deficient number, since it is larger than the sum of its proper divisors (1).

9667390921 is an equidigital number, since it uses as much as digits as its factorization.

9667390921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1102248, while the sum is 52.

The square root of 9667390921 is about 98322.8911342623. The cubic root of 9667390921 is about 2130.2787090018.

The spelling of 9667390921 in words is "nine billion, six hundred sixty-seven million, three hundred ninety thousand, nine hundred twenty-one".