9966791 has 2 divisors, whose sum is σ = 9966792. Its totient is φ = 9966790.

The previous prime is 9966769. The next prime is 9966799. The reversal of 9966791 is 1976699.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1976699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9966791 - 2¹⁴ = 9950407 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9966799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4983395 + 4983396.

It is an arithmetic number, because the mean of its divisors is an integer number (4983396).

Almost surely, 2^9966791 is an apocalyptic number.

9966791 is a deficient number, since it is larger than the sum of its proper divisors (1).

9966791 is an equidigital number, since it uses as much as digits as its factorization.

9966791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 183708, while the sum is 47.

The square root of 9966791 is about 3157.0224896253. The cubic root of 9966791 is about 215.2047157772.

The spelling of 9966791 in words is "nine million, nine hundred sixty-six thousand, seven hundred ninety-one".