9964781 has 2 divisors, whose sum is σ = 9964782. Its totient is φ = 9964780.

The previous prime is 9964769. The next prime is 9964789. The reversal of 9964781 is 1874699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9672100 + 292681 = 3110^2 + 541^2 .

It is an emirp because it is prime and its reverse (1874699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9964781 - 2²² = 5770477 is a prime.

It is a super-2 number, since 2×9964781² = 198593720755922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9964789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4982390 + 4982391.

It is an arithmetic number, because the mean of its divisors is an integer number (4982391).

Almost surely, 2^9964781 is an apocalyptic number.

It is an amenable number.

9964781 is a deficient number, since it is larger than the sum of its proper divisors (1).

9964781 is an equidigital number, since it uses as much as digits as its factorization.

9964781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 9964781 is about 3156.7041356453. The cubic root of 9964781 is about 215.1902480460.

The spelling of 9964781 in words is "nine million, nine hundred sixty-four thousand, seven hundred eighty-one".