9745991 has 4 divisors (see below), whose sum is σ = 9783312. Its totient is φ = 9708672.

The previous prime is 9745979. The next prime is 9745999. The reversal of 9745991 is 1995479.

9745991 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 an emirpimes, since its reverse is a distinct semiprime: 1995479 = 47 ⋅42457.

It is a cyclic number.

It is not a de Polignac number, because 9745991 - 2¹⁸ = 9483847 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 (9745999) 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, 18266 + ... + 18791.

It is an arithmetic number, because the mean of its divisors is an integer number (2445828).

Almost surely, 2^9745991 is an apocalyptic number.

9745991 is a deficient number, since it is larger than the sum of its proper divisors (37321).

9745991 is a wasteful number, since it uses less digits than its factorization.

9745991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37320.

The product of its digits is 102060, while the sum is 44.

The square root of 9745991 is about 3121.8569794275. The cubic root of 9745991 is about 213.6036495774.

The spelling of 9745991 in words is "nine million, seven hundred forty-five thousand, nine hundred ninety-one".