9998023961 has 2 divisors, whose sum is σ = 9998023962. Its totient is φ = 9998023960.

The previous prime is 9998023921. The next prime is 9998024017. The reversal of 9998023961 is 1693208999.

9998023961 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (9998024017) can be obtained adding 9998023961 to its sum of digits (56).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9400465936 + 597558025 = 96956^2 + 24445^2 .

It is an emirp because it is prime and its reverse (1693208999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9998023961 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 9998023897 and 9998023906.

It is not a weakly prime, because it can be changed into another prime (9998023921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999011980 + 4999011981.

It is an arithmetic number, because the mean of its divisors is an integer number (4999011981).

Almost surely, 2^9998023961 is an apocalyptic number.

It is an amenable number.

9998023961 is a deficient number, since it is larger than the sum of its proper divisors (1).

9998023961 is an equidigital number, since it uses as much as digits as its factorization.

9998023961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1889568, while the sum is 56.

The square root of 9998023961 is about 99990.1193168605. The cubic root of 9998023961 is about 2154.2927724513.

The spelling of 9998023961 in words is "nine billion, nine hundred ninety-eight million, twenty-three thousand, nine hundred sixty-one".