9621918841 has 2 divisors, whose sum is σ = 9621918842. Its totient is φ = 9621918840.

The previous prime is 9621918829. The next prime is 9621918871. The reversal of 9621918841 is 1488191269.

9621918841 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7422684025 + 2199234816 = 86155^2 + 46896^2 .

It is an emirp because it is prime and its reverse (1488191269) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9621918841 - 2²⁹ = 9085047929 is a prime.

It is not a weakly prime, because it can be changed into another prime (9621918871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4810959420 + 4810959421.

It is an arithmetic number, because the mean of its divisors is an integer number (4810959421).

Almost surely, 2^9621918841 is an apocalyptic number.

It is an amenable number.

9621918841 is a deficient number, since it is larger than the sum of its proper divisors (1).

9621918841 is an equidigital number, since it uses as much as digits as its factorization.

9621918841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 49.

The square root of 9621918841 is about 98091.3800545186. The cubic root of 9621918841 is about 2126.9334258387.

The spelling of 9621918841 in words is "nine billion, six hundred twenty-one million, nine hundred eighteen thousand, eight hundred forty-one".