9940881761 has 2 divisors, whose sum is σ = 9940881762. Its totient is φ = 9940881760.

The previous prime is 9940881707. The next prime is 9940881791. The reversal of 9940881761 is 1671880499.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6763417600 + 3177464161 = 82240^2 + 56369^2 .

It is a cyclic number.

It is not a de Polignac number, because 9940881761 - 2¹⁰ = 9940880737 is a prime.

It is a super-2 number, since 2×9940881761² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9940881791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4970440880 + 4970440881.

It is an arithmetic number, because the mean of its divisors is an integer number (4970440881).

Almost surely, 2^9940881761 is an apocalyptic number.

It is an amenable number.

9940881761 is a deficient number, since it is larger than the sum of its proper divisors (1).

9940881761 is an equidigital number, since it uses as much as digits as its factorization.

9940881761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 53.

The square root of 9940881761 is about 99703.9706380844. The cubic root of 9940881761 is about 2150.1807499743.

The spelling of 9940881761 in words is "nine billion, nine hundred forty million, eight hundred eighty-one thousand, seven hundred sixty-one".