9998971 has 2 divisors, whose sum is σ = 9998972. Its totient is φ = 9998970.

The previous prime is 9998969. The next prime is 9998977. The reversal of 9998971 is 1798999.

9998971 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 is an emirp because it is prime and its reverse (1798999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9998971 - 2¹ = 9998969 is a prime.

Together with 9998969, it forms a pair of twin primes.

9998971 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (9998977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999485 + 4999486.

It is an arithmetic number, because the mean of its divisors is an integer number (4999486).

Almost surely, 2^9998971 is an apocalyptic number.

9998971 is a deficient number, since it is larger than the sum of its proper divisors (1).

9998971 is an equidigital number, since it uses as much as digits as its factorization.

9998971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 367416, while the sum is 52.

The square root of 9998971 is about 3162.1149567971. The cubic root of 9998971 is about 215.4360790387.

The spelling of 9998971 in words is "nine million, nine hundred ninety-eight thousand, nine hundred seventy-one".