9998751 has 16 divisors (see below), whose sum is σ = 15321344. Its totient is φ = 5681664.

The previous prime is 9998749. The next prime is 9998753. The reversal of 9998751 is 1578999.

9998751 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (9998749) and next prime (9998753).

It is not a de Polignac number, because 9998751 - 2¹ = 9998749 is a prime.

It is an Ulam number.

It is a Duffinian number.

9998751 is a lucky number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 9998751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9998753) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2820 + ... + 5286.

It is an arithmetic number, because the mean of its divisors is an integer number (957584).

Almost surely, 2^9998751 is an apocalyptic number.

9998751 is a deficient number, since it is larger than the sum of its proper divisors (5322593).

9998751 is a wasteful number, since it uses less digits than its factorization.

9998751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2670.

The product of its digits is 204120, while the sum is 48.

The square root of 9998751 is about 3162.0801697617. The cubic root of 9998751 is about 215.4344990000.

The spelling of 9998751 in words is "nine million, nine hundred ninety-eight thousand, seven hundred fifty-one".