9681731 has 4 divisors (see below), whose sum is σ = 9709512. Its totient is φ = 9653952.

The previous prime is 9681709. The next prime is 9681739. The reversal of 9681731 is 1371869.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1371869 = 463 ⋅2963.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9681731 is a prime.

It is a super-2 number, since 2×9681731² = 187471830312722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9681691 and 9681700.

It is not an unprimeable number, because it can be changed into a prime (9681739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13361 + ... + 14066.

It is an arithmetic number, because the mean of its divisors is an integer number (2427378).

Almost surely, 2^9681731 is an apocalyptic number.

9681731 is a deficient number, since it is larger than the sum of its proper divisors (27781).

9681731 is a wasteful number, since it uses less digits than its factorization.

9681731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27780.

The product of its digits is 9072, while the sum is 35.

The square root of 9681731 is about 3111.5480070216. The cubic root of 9681731 is about 213.1331501600.

The spelling of 9681731 in words is "nine million, six hundred eighty-one thousand, seven hundred thirty-one".