9724991 has 4 divisors (see below), whose sum is σ = 9731232. Its totient is φ = 9718752.

The previous prime is 9724961. The next prime is 9724993. The reversal of 9724991 is 1994279.

It is a happy number.

9724991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1994279 = 7 ⋅284897.

It is a cyclic number.

It is not a de Polignac number, because 9724991 - 2⁶ = 9724927 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 (9724993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1415 + ... + 4631.

It is an arithmetic number, because the mean of its divisors is an integer number (2432808).

Almost surely, 2^9724991 is an apocalyptic number.

9724991 is a deficient number, since it is larger than the sum of its proper divisors (6241).

9724991 is a wasteful number, since it uses less digits than its factorization.

9724991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6240.

The product of its digits is 40824, while the sum is 41.

The square root of 9724991 is about 3118.4917828976. The cubic root of 9724991 is about 213.4501197033.

The spelling of 9724991 in words is "nine million, seven hundred twenty-four thousand, nine hundred ninety-one".