9998000731 has 2 divisors, whose sum is σ = 9998000732. Its totient is φ = 9998000730.

The previous prime is 9998000729. The next prime is 9998000777. The reversal of 9998000731 is 1370008999.

It is an a-pointer prime, because the next prime (9998000777) can be obtained adding 9998000731 to its sum of digits (46).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9998000731 - 2¹ = 9998000729 is a prime.

It is a super-2 number, since 2×9998000731² (a number of 21 digits) contains 22 as substring.

Together with 9998000729, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (9998000231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999000365 + 4999000366.

It is an arithmetic number, because the mean of its divisors is an integer number (4999000366).

Almost surely, 2^9998000731 is an apocalyptic number.

9998000731 is a deficient number, since it is larger than the sum of its proper divisors (1).

9998000731 is an equidigital number, since it uses as much as digits as its factorization.

9998000731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 9998000731 is about 99990.0031553155. The cubic root of 9998000731 is about 2154.2911039796.

The spelling of 9998000731 in words is "nine billion, nine hundred ninety-eight million, seven hundred thirty-one", and thus it is an aban number.