9920714681 has 2 divisors, whose sum is σ = 9920714682. Its totient is φ = 9920714680.

The previous prime is 9920714677. The next prime is 9920714743. The reversal of 9920714681 is 1864170299.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7176631225 + 2744083456 = 84715^2 + 52384^2 .

It is an emirp because it is prime and its reverse (1864170299) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9920714681 - 2² = 9920714677 is a prime.

It is a super-2 number, since 2×9920714681² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9920714611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4960357340 + 4960357341.

It is an arithmetic number, because the mean of its divisors is an integer number (4960357341).

Almost surely, 2^9920714681 is an apocalyptic number.

It is an amenable number.

9920714681 is a deficient number, since it is larger than the sum of its proper divisors (1).

9920714681 is an equidigital number, since it uses as much as digits as its factorization.

9920714681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 9920714681 is about 99602.7845042497. The cubic root of 9920714681 is about 2148.7257407585.

The spelling of 9920714681 in words is "nine billion, nine hundred twenty million, seven hundred fourteen thousand, six hundred eighty-one".