9931601 has 4 divisors (see below), whose sum is σ = 10274100. Its totient is φ = 9589104.

The previous prime is 9931591. The next prime is 9931613. The reversal of 9931601 is 1061399.

9931601 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: 1061399 = 239 ⋅4441.

It can be written as a sum of positive squares in 2 ways, for example, as 3904576 + 6027025 = 1976^2 + 2455^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9931601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 342469 = 9931601 / (9 + 9 + 3 + 1 + 6 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9931631) 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, 171206 + ... + 171263.

It is an arithmetic number, because the mean of its divisors is an integer number (2568525).

Almost surely, 2^9931601 is an apocalyptic number.

It is an amenable number.

9931601 is a deficient number, since it is larger than the sum of its proper divisors (342499).

9931601 is a wasteful number, since it uses less digits than its factorization.

9931601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342498.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 9931601 is about 3151.4442720759. Note that the first 3 decimals coincide. The cubic root of 9931601 is about 214.9511408716.

The spelling of 9931601 in words is "nine million, nine hundred thirty-one thousand, six hundred one".