9442991 has 4 divisors (see below), whose sum is σ = 9464112. Its totient is φ = 9421872.

The previous prime is 9442969. The next prime is 9443011. The reversal of 9442991 is 1992449.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1992449 = 179 ⋅11131.

It is a cyclic number.

It is not a de Polignac number, because 9442991 - 2¹⁰ = 9441967 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 (9442921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9875 + ... + 10788.

It is an arithmetic number, because the mean of its divisors is an integer number (2366028).

Almost surely, 2^9442991 is an apocalyptic number.

9442991 is a deficient number, since it is larger than the sum of its proper divisors (21121).

9442991 is a wasteful number, since it uses less digits than its factorization.

9442991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21120.

The product of its digits is 23328, while the sum is 38.

The square root of 9442991 is about 3072.9450043891. The cubic root of 9442991 is about 211.3666797041.

The spelling of 9442991 in words is "nine million, four hundred forty-two thousand, nine hundred ninety-one".