9948991 has 4 divisors (see below), whose sum is σ = 10714312. Its totient is φ = 9183672.

The previous prime is 9948979. The next prime is 9949021. The reversal of 9948991 is 1998499.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1998499 = 449 ⋅4451.

It is a cyclic number.

It is not a de Polignac number, because 9948991 - 2¹¹ = 9946943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9948931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 382641 + ... + 382666.

It is an arithmetic number, because the mean of its divisors is an integer number (2678578).

Almost surely, 2^9948991 is an apocalyptic number.

9948991 is a deficient number, since it is larger than the sum of its proper divisors (765321).

9948991 is a wasteful number, since it uses less digits than its factorization.

9948991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765320.

The product of its digits is 209952, while the sum is 49.

The square root of 9948991 is about 3154.2021178105. The cubic root of 9948991 is about 215.0765258504.

The spelling of 9948991 in words is "nine million, nine hundred forty-eight thousand, nine hundred ninety-one".