9996781 has 2 divisors, whose sum is σ = 9996782. Its totient is φ = 9996780.

The previous prime is 9996757. The next prime is 9996803. The reversal of 9996781 is 1876999.

9996781 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 can be written as a sum of positive squares in only one way, i.e., 5134756 + 4862025 = 2266^2 + 2205^2 .

It is an emirp because it is prime and its reverse (1876999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9996781 - 2¹⁵ = 9964013 is a prime.

It is a super-2 number, since 2×9996781² = 199871260723922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9996751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4998390 + 4998391.

It is an arithmetic number, because the mean of its divisors is an integer number (4998391).

Almost surely, 2^9996781 is an apocalyptic number.

It is an amenable number.

9996781 is a deficient number, since it is larger than the sum of its proper divisors (1).

9996781 is an equidigital number, since it uses as much as digits as its factorization.

9996781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 49.

The square root of 9996781 is about 3161.7686506131. The cubic root of 9996781 is about 215.4203494381.

The spelling of 9996781 in words is "nine million, nine hundred ninety-six thousand, seven hundred eighty-one".