9672781 has 2 divisors, whose sum is σ = 9672782. Its totient is φ = 9672780.

The previous prime is 9672763. The next prime is 9672791. The reversal of 9672781 is 1872769.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9455625 + 217156 = 3075^2 + 466^2 .

It is an emirp because it is prime and its reverse (1872769) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9672781 - 2⁵ = 9672749 is a prime.

It is a super-2 number, since 2×9672781² = 187125384547922, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9672791) 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, 4836390 + 4836391.

It is an arithmetic number, because the mean of its divisors is an integer number (4836391).

Almost surely, 2^9672781 is an apocalyptic number.

It is an amenable number.

9672781 is a deficient number, since it is larger than the sum of its proper divisors (1).

9672781 is an equidigital number, since it uses as much as digits as its factorization.

9672781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 40.

The square root of 9672781 is about 3110.1094836034. The cubic root of 9672781 is about 213.0674549592.

The spelling of 9672781 in words is "nine million, six hundred seventy-two thousand, seven hundred eighty-one".