9656551 has 2 divisors, whose sum is σ = 9656552. Its totient is φ = 9656550.

The previous prime is 9656539. The next prime is 9656557. The reversal of 9656551 is 1556569.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9656551 - 2⁹ = 9656039 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9656551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9656557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4828275 + 4828276.

It is an arithmetic number, because the mean of its divisors is an integer number (4828276).

Almost surely, 2^9656551 is an apocalyptic number.

9656551 is a deficient number, since it is larger than the sum of its proper divisors (1).

9656551 is an equidigital number, since it uses as much as digits as its factorization.

9656551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40500, while the sum is 37.

The square root of 9656551 is about 3107.4991552694. The cubic root of 9656551 is about 212.9482193188.

The spelling of 9656551 in words is "nine million, six hundred fifty-six thousand, five hundred fifty-one".