9998251 has 4 divisors (see below), whose sum is σ = 10268512. Its totient is φ = 9727992.

The previous prime is 9998249. The next prime is 9998273. The reversal of 9998251 is 1528999.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9998251 - 2¹ = 9998249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9998198 and 9998207.

It is not an unprimeable number, because it can be changed into a prime (9998201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135075 + ... + 135148.

It is an arithmetic number, because the mean of its divisors is an integer number (2567128).

Almost surely, 2^9998251 is an apocalyptic number.

9998251 is a deficient number, since it is larger than the sum of its proper divisors (270261).

9998251 is a wasteful number, since it uses less digits than its factorization.

9998251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270260.

The product of its digits is 58320, while the sum is 43.

The square root of 9998251 is about 3162.0011068942. The cubic root of 9998251 is about 215.4309079166.

The spelling of 9998251 in words is "nine million, nine hundred ninety-eight thousand, two hundred fifty-one".