9616991 has 2 divisors, whose sum is σ = 9616992. Its totient is φ = 9616990.

The previous prime is 9616987. The next prime is 9617011. The reversal of 9616991 is 1996169.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9616991 - 2² = 9616987 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9616291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4808495 + 4808496.

It is an arithmetic number, because the mean of its divisors is an integer number (4808496).

Almost surely, 2^9616991 is an apocalyptic number.

9616991 is a deficient number, since it is larger than the sum of its proper divisors (1).

9616991 is an equidigital number, since it uses as much as digits as its factorization.

9616991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26244, while the sum is 41.

The square root of 9616991 is about 3101.1273756491. The cubic root of 9616991 is about 212.6570262672.

The spelling of 9616991 in words is "nine million, six hundred sixteen thousand, nine hundred ninety-one".