9850616981 has 2 divisors, whose sum is σ = 9850616982. Its totient is φ = 9850616980.

The previous prime is 9850616953. The next prime is 9850617017. The reversal of 9850616981 is 1896160589.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9834688900 + 15928081 = 99170^2 + 3991^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9850616981 is a prime.

It is a super-2 number, since 2×9850616981² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain 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 (9850616081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4925308490 + 4925308491.

It is an arithmetic number, because the mean of its divisors is an integer number (4925308491).

Almost surely, 2^9850616981 is an apocalyptic number.

It is an amenable number.

9850616981 is a deficient number, since it is larger than the sum of its proper divisors (1).

9850616981 is an equidigital number, since it uses as much as digits as its factorization.

9850616981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 933120, while the sum is 53.

The square root of 9850616981 is about 99250.2744630966. The cubic root of 9850616981 is about 2143.6529582719.

The spelling of 9850616981 in words is "nine billion, eight hundred fifty million, six hundred sixteen thousand, nine hundred eighty-one".