9664651 has 2 divisors, whose sum is σ = 9664652. Its totient is φ = 9664650.

The previous prime is 9664631. The next prime is 9664661. The reversal of 9664651 is 1564669.

9664651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9664651 - 2¹⁵ = 9631883 is a prime.

9664651 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 9664651.

It is not a weakly prime, because it can be changed into another prime (9664601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4832325 + 4832326.

It is an arithmetic number, because the mean of its divisors is an integer number (4832326).

Almost surely, 2^9664651 is an apocalyptic number.

9664651 is a deficient number, since it is larger than the sum of its proper divisors (1).

9664651 is an equidigital number, since it uses as much as digits as its factorization.

9664651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 37.

The square root of 9664651 is about 3108.8021809051. The cubic root of 9664651 is about 213.0077436258.

The spelling of 9664651 in words is "nine million, six hundred sixty-four thousand, six hundred fifty-one".