9620011981 has 2 divisors, whose sum is σ = 9620011982. Its totient is φ = 9620011980.

The previous prime is 9620011963. The next prime is 9620012027. The reversal of 9620011981 is 1891100269.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7722015625 + 1897996356 = 87875^2 + 43566^2 .

It is an emirp because it is prime and its reverse (1891100269) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9620011981 - 2⁵ = 9620011949 is a prime.

It is a super-2 number, since 2×9620011981² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9620011981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9620011931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4810005990 + 4810005991.

It is an arithmetic number, because the mean of its divisors is an integer number (4810005991).

Almost surely, 2^9620011981 is an apocalyptic number.

It is an amenable number.

9620011981 is a deficient number, since it is larger than the sum of its proper divisors (1).

9620011981 is an equidigital number, since it uses as much as digits as its factorization.

9620011981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 37.

The square root of 9620011981 is about 98081.6597585910. The cubic root of 9620011981 is about 2126.7929122090.

The spelling of 9620011981 in words is "nine billion, six hundred twenty million, eleven thousand, nine hundred eighty-one".